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Filtrete Products
Frequently Asked Questions (FAQ)
 

General Information | Installation Questions | Troubleshooting

General Information

Do programmable thermostats really save energy?
What does a thermostat do?
How does a programmable thermostat work?
Can a mechanical or manual be replaced with a programmable thermostat?
Can I use a Filtrete (TM) Thermostat from 3M with my system?
How do I know if I have a Heat Pump?
What is a Heat Pump?
What is Emergency heat for on a heat pump?
How do I know if I can use a Filtrete (TM) Thermostat from 3M with my heat pump?
Will a Filtrete (TM) Thermostat from 3M control a two-speed blower?
Can I use this in my trailer or motor home for heating and cooling?
Can I use a Filtrete (TM) Thermostat from 3M with a two-stage gas, oil, propane or a two stage electric furnace system (W1 and W2)?
Will a Filtrete (TM) Thermostat from 3M work with a three-wire, zoned, hot water system?
Can I use a Filtrete (TM) Thermostat from 3M in my trailer or motor home?
Can I use a Filtrete (TM) Thermostat from 3M with a two stage cooling system?
Can I use a Filtrete (TM) Thermostat from 3M with a Zoned forced air heating and cooling system?
Do Filtrete (TM) Thermostat from 3Ms work with all types of fuel and heating systems?
Can I use a Filtrete (TM) Thermostat from 3M with my swamp cooler?
Can I use a Filtrete (TM) Thermostat from 3M with my baseboard electric heat?
I was told to get a thermostat with “short Cycle delay”, what is that?
Is it important to level the new Filtrete (TM) Thermostat from 3M?

Installation Questions

How do I determine what type of heat I have?
How do I wire the thermostat?
How should the wires be prepared for installation in the wire terminal block on the 3M22 thru 3M50 thermostats?
Where should I connect the C wire?
What do I do with the W2 and/or E and/or X2 wires?
Where does the red wire go?
What do I do with the extra wires in the wall that are not connected?
Do I need to match the wire colors to the letters on my Filtrete (TM) Thermostat from 3M?
What do I do with the W2 or E or X1 or X2 or X or L or T wire?
I am not sure if I have a C wire. How do I determine if I do?
Can my thermostat be used on batteries as well as 24VAC from the heater?
My old thermostat had an anticipator adjustment. Where is it on yours?
How long do the batteries last?
What does the red blinking light mean?
What does the half full battery icon mean?
Can I use rechargeable batteries in the Filtrete (TM) Thermostat from 3M?
The thermostat is blinking between time and temperature how can I stop this?
When in calibration mode what does the T-FACTOR on my thermostat mean?

Troubleshooting

Why doesn’t the remote work on my Filtrete (TM) Thermostat from 3M?
If you need to install a C wire, please see FAQ: “How to install a C wire?
I installed a new thermostat and my heating and/or cooling does not come on. Why?
I installed a new thermostat and my system is running continuously. Why?
Why does the temperature fluctuate uncomfortably with my new thermostat?
The room temperature reading appears to be incorrect. Why?
The thermostat occasionally resets to factory setting. What could be causing this?
My heat is shutting down before it reaches temperature?
Why does the room temperature take so long to respond?
Why does the thermostat change settings by itself?
My unit is blinking the word heat. What does this mean?
My unit is blinking the word cool. What does this mean?

General Information

Do programmable thermostats really save energy?
Yes, programmable thermostats can save energy which in turn saves you money on your utility bill. With the proper use of pre-programmed settings, a programmable thermostat can save you about $120.00 every year in energy costs.

What does a thermostat do?
In the most basic form the thermostat is a temperature controlled on/ off switch. For example if the thermostat is in the heat mode the thermostat will turn on the heat when the room temperature is lower than the set temperature and turn the heat off when the room temperature is higher than the room temperature. When the thermostat is in the cool mode it will turn on the Air Conditioner (if present) when the room temperature is above the set temperature and turn it off when the room temperature is lower than the set temperature.

How does a programmable thermostat work?
A programmable thermostat follows ether a preset program or a user-defined program. The program tell the thermostat what temperature to maintain during a given time period. In most programs there are comfort periods and energy save periods. Energy save period are usually used when you are away or a sleep. Comfort periods are for when you are at home and awake.

Can a mechanical or manual be replaced with a programmable thermostat?
Yes, in most case it can. The 3M Filtrete programmable thermostats are compatible with low voltage (mili-volt to 24 volt) whole house residential systems. The current wiring on your existing thermostat will be used with the new thermostat. Some models are made to be compatible with line voltage heating systems like wall or baseboard heaters. See compatibility chart for details.

Can I use a Filtrete (TM) Thermostat from 3M with my system?
Yes, in most case it can. The Filtrete (TM) Thermostat from 3Ms are compatible with low voltage (mili-volt to 24 volt) whole house residential systems. The current wiring on your existing thermostat will be used with the new thermostat. We also make units that are compatible with high voltage systems 120 to 240 volts. See compatibility matrix for details.

How do I know if I have a Heat Pump?

If you have a heat pump when your heat is running the unit outside with the fan on top (compressor) will be running also and it will be blowing cold air. To verify that you have a heat pump, look at the labels on the outside portion of your heating/air conditioning unit (if it is a heat pump this is your heat exchanger). Somewhere on the unit it should say “heat pump”, if it is a heat pump. Also if you have an “O” or “B” thermostat connection, you may have a heat pump.


What is a Heat Pump?

A heat pump is essentially and air conditioner (A/C) that can work in reverse. An A/C pumps heat out of the house into and outside air exchanger and into the outside air. A heat pump uses very similar equipment and pumps heat from the outside air into the house. The heat pump has a “reversing valve” to go from Cool to Heat. An Air Conditioner gets less efficient in cooling a house as the outside air gets hotter. Similarly, the heat pump gets less efficient as the outside air gets colder.


What is Emergency heat for on a heat pump?

Emergency heat is a common term for secondary heat. On most heat pumps electric heat strips are used to quickly heat up the house. If your heat pump cannot bring the house up to temperature it will engage auxiliary along with heat pump to bring the temperature up quicker. But if it is very cold outside (under 35 degrees) the heat pump is not efficient so, it is best to tell the thermostat to only use the 2nd heat source only (emergency heat). This costs more money to run so when the outside temperature increases put the system back in normal heat pump mode. On some units the 2nd heat source is not electric. These systems are called duel fuel systems. The 2nd stage heat may be a gas, oil or propane furnace.


How do I know if I can use a Filtrete (TM) Thermostat from 3M with my heat pump?

Filtrete (TM) Thermostat from 3Ms are currently available for single stage heat pumps and heat pumps with auxiliary heat. If you have an emergency heat switch and have a W2 wire and/or X2 and /or E wire on your current thermostat, you need a Filtrete (TM) Thermostat from 3M compatible with heat pumps with 2 stage heat. See compatibility Matrix for compatible models.


Will a Filtrete (TM) Thermostat from 3M control a two-speed blower?
Yes, but ONLY as a Single speed blower. Use the G1 wire from the blower for low speed all the time or G2 for high speed all the time. Mark and tape off the unused wire.


Can I use this in my trailer or motor home for heating and cooling?
Yes, make sure the thermostat’s single/two source power jumper is set for 2 source power (RC and RH separate) and reset the thermostat. Connect the two wires for you 12V heating to RH and W. Connect your two low voltage AC wires to RC and Y. If you have a FAN wire from the AC connect it to G. If you have a two-speed fan control, connect the G1 wire for low speed or the G2 wire for high speed, mark and tape off the unused wire.

Can I use a Filtrete (TM) Thermostat from 3M with a two-stage gas, oil, propane or a two stage electric furnace system (W1 and W2)?
Yes, we make several units that will work with this type of system. Please see compatibility matrix for specific models. You will hook up the first stage of heat (W or W1) to the “W” terminal and the second stage of heat (W2) to the “W2” terminal.

Will a Filtrete (TM) Thermostat from 3M work with a three-wire, zoned, hot water system?
Yes, we make several units that will work with this type of system Please see compatibility matrix for specific models.

My Mobile home has a manual Heat/cool switch separate from my thermostat. Can I use a Filtrete (TM) Thermostat from 3M?
Yes. Connect the two wires to RH and W and leave the thermostat in the Heat position all the time. The thermostat becomes a temperature controlled on /off switch. If the thermostat control’s seems backwards, re-connect the two wires to RC and Y and leave the thermostat in the cool position all of the time.

Can I use a Filtrete (TM) Thermostat from 3M in my trailer or motor home?
Yes, we make several units that will work. Please see compatibility matrix for specific models. Then just follow the installation instructions for your heater and Air Conditioning system type (Propane, gas, elect etc)


Can I use a Filtrete (TM) Thermostat from 3M with a two stage cooling system?
Yes, we make several units that will work with this type of system Please see compatibility matrix for specific models.

Can I use a Filtrete (TM) Thermostat from 3M with a Zoned forced air heating and cooling system?
Yes, most zoned forced are systems have a master control board which controls the baffles in the forced air system to allow heat or cool into the areas calling for it. This allows different areas of the house to be at different temperatures as a function of that area’s own thermostat using a single heating and cooling system.
The selection of heat or cool is made by the master controller. If you wish to use Filtrete (TM) Thermostat from 3Ms at the remotes you must remember to make sure all thermostats are in the same mode ether heat or cool.
Some zoned forced are systems master controllers use both B and O and some use just one of the letters. Be sure it is a forced air zoned system before connecting both the O and B. Some of the brands of zoned forced air controllers are Durazone, Trol-A -Temp and Comfort Zone.
For more information on hooking up these types of system please contact support at 888-607-5824 or filtrete@radiothermostat.com


Do Filtrete (TM) Thermostat from 3Ms work with all types of fuel and heating systems?

Yes, any 2 wire, low voltage, or milli-volt heating system can be used with a Filtrete (TM) Thermostat from 3M. This included all 2 wire hydronic (hot water) heating systems, regardless of fuel types. If you have a 3 wire hydronic (hot water) heating system please see compatibility matrix for the correct thermostat model.


Can I use a Filtrete (TM) Thermostat from 3M with my swamp cooler?

Yes and No. It depends on the swamp cooler. Some of these units are high voltage and others are low voltage. If the unit is low voltage in most case it will work and be connect like any air conditioning system, i.e. RC, Y and G (sometimes G2) If there is a two speed fan, connect just the G fan wire to the thermostat’s G terminal for low or both fan wires (G and G2) to the thermostat’s G terminal for high fan.
Our 6002 is a line voltage thermostat that can do heat or cool and would work fine with swamp coolers particularly the large roof mounted type.


Can I use a Filtrete (TM) Thermostat from 3M with my baseboard electric heat?

No, We do not make any thermostats that are compatible with 120 to 240 volt systems.

Can a programmable thermostat be programmed to fit my schedule even if there is a program per installed?
Yes, the 3M Filtrete programmable thermostat gives you the flexibility to change the existing program to fit your specific needs. Easy-to-understand instructions are included to help you change the program and with the copy function it is quick and easy to make the changes.

I was told to get a thermostat with “short Cycle delay”, what is that?
All Filtrete (TM) Thermostat from 3Ms with cool capability have a built in approximately 5 minute shot cycle delay from the time a compressor turns off until the thermostat will turn it back on. This is to prevent compressor stall. The delay in not present if the thermostat is turned from cool to off and back to cool or heat to off and back to heat and also if you do not have a C wire attached to the thermostat and there is a power outage. However, if you have a C wire attached and there is a power outage it will have a delay.

Is it important to level the new Filtrete (TM) Thermostat from 3M?
No, Filtrete (TM) Thermostat from 3M are all digital and do not require leveling.

Is there someone I can contact if I have a question about the installation or operation of my Filtrete (TM) Thermostat from 3M?
Yes, 3M Filtrete offers a US-based technical support staff to help you with any questions you may have. Technical assistance is available over the phone at 888-607-5824 or Via Email at Filtrete@radiothermostat.com

Installation Questions

How do I determine what type of heat I have?

There may be several ways to determine what type of heat you have. First, if you can access the unit that is responsible for creating the heat, you may find some indication of the type of heat you have on somewhere on the unit. A good place to look is on the yellow Energy Star Sticker; near the bottom of the sticker it will tell you the type of heat. If you are the owner of your home, check the paperwork on your home you received at the time of purchase, as often there will be a description of the type of heating you have in the home. There are other things you can consider, such as the following.

A furnace draws air from the house into a ductwork system, taking it to an area where it is warmed before being delivered back to living spaces. Newer furnaces use blowers to recirculate the warmed air. A furnace may be fueled with gas, electricity, oil, or even coal or wood. Gas and oil furnaces light a burner that warms a heat exchange unit, which in turn warms the air before it is circulated back through the house. These furnaces have a flue where exhaust gases vent to the outside. An electric furnace uses heating strips, or elements, to warm the air. A wood or coal furnace has a sealed firebox where the fuel is burned and a heat exchanger where air is warmed before delivery.

A heat pump on the other hand works by shuffling heat from one place to another. They also serve as air conditioners during warm weather, so a heat pump is an air conditioner that works in reverse to make heat. Ask yourself whether or not the unit that you think of as an air conditioner (usually located outside) runs when you are calling for heat. If so, you have a heat pump. Heat pumps also have air handlers (usually located inside the home), which are responsible for circulating the air through the home. Heat pumps extract warmth from outdoor air, from ground or surface water, or from the earth. The air is warmed more by the system if necessary and then circulated through the house. You'll find metal vents and filters similar to those used for forced air furnaces. The outdoor unit usually states 'heat pump' on its label.

Baseboard heaters are often visible as long, metal units with electrical elements inside. Each unit has its own control and is often high voltage.

Radiant systems warm objects in much the same way as the sun does. No blowers are used. Electric radiant elements are installed in floors or ceilings.

Hydronic heating is another type of radiant heat where hot water flows through tubes under the floor or through units that resemble baseboard heaters. A hydronic system might be installed in ceilings. Hydronic heating systems include a boiler that warms circulating water.


How do I wire the thermostat?

To wire the thermostat you need to determine what wires you have. To find out what wires you have you should turn off the power to your heating and cooling system. Then remove the thermostat from the wall and note where the wires are attached. The wires will be attached to terminal with letters by them. For example the red wire attached to R or perhaps a blue wire attached to Y, etc. Do not assume that the color of the wire will match the letter on the thermostat. Once you determine which wires you have please referred to the wiring diagrams for the model 3M Filtrete you have. There is no color code; even if some of the wire colors seem to match the letters, do not use the wire color, use just match the letters to connect the wires.


How should the wires be prepared for installation in the wire terminal block on the 3M22 thru 3M50 thermostats?

To wire the thermostat strip the wires back about 1/8 of an inch. Insert the wire in the correct terminal making sure you go through both holes and then snug the screw down tight enough to get a good contact but not too tight that you break the wire or the screw. Then pull on the wire to make sure it is connected.


I have 5 wires and 4 of them connect to the old thermostat. Where do I connect the other wire to?

Only re-connect the wires that were connected to the old thermostat. Do not connect any other wires as you do not know where or it they are connected to the heating and or cooling system. Do not connect the extra wire to the C or any other terminal.


Where should I connect the C wire?

If you have a ”C” wire, connect it to the “C” terminal. Do not connect anything else to the “C” terminal.


What do I do with the W2 and/or E and/or X2 wires?

W2 or X2 wires are used on two-stage gas or oil or electric heating systems or a heat pump with auxiliary heat. If there is an E wire tape it off as it is not necessary. 3M Filtrete has several units that are compatible with multistage heating and heat pump systems. See compatibility Matrix for compatible models. All or just some of these wires may be used with the new thermostat. Please refer to the installation manual or contact support at 888-607-5824 or email filtrete@radiothermostat.com


Where does the red wire go?

If the red wire was connected to the R terminal on the old thermostat, then connect to the RH terminal on the new thermostat. If a different colored wire was connected to the R terminal on the old unit then label it and connect to the new thermostat in the same way. Always rerer to the letter to which the wire was connected on the old thermostat before removing the wire. This will be the label for your wire. There is no color code, just a letter code.


My old thermostat has two wires, but the installation instructions for my Filtrete (TM) Thermostat from 3M show only a three wire installation.

On a two wire low voltage, heat only systems connect to the RH and the W terminals. The “C” (common) wire is optional, and is not needed to run the thermostat. If you have the “C” wire, connect it to the “C” terminal, and it will extend the thermostat’s battery life substantially.


What do I do with the extra wires in the wall that are not connected?

Leave them disconnected but tape the wires off so they do not touch each other or any other wire. If you do not have a “C” wire, the next time your furnace is serviced, ask the technician to connect one of the extra wired to the “C” (common) connection at the furnace and the “C” terminal in the thermostat to extend the life of your batteries.


Do I need to match the wire colors to the letters on my Filtrete (TM) Thermostat from 3M?

No, sometimes the colors match the letters but not always. Be sure to label the wires according to the letters they connected to on the old thermostat first and wire according to terminals the wires were attached to.


What do I do with the W2 or E or X1 or X2 or X or L or T wire?

In most cases these wires are not used and should be individually taped off. But sometimes they are used for example W2 is 2nd stage of heat in a conventional heating system and should be connected to W2. In a heat pump system W2, E, X1 or X2 are used to turn on auxiliary/emergency heat and one of them should be attached to the W2 terminal. Which one you connect depends on the system. The X wire sometimes corresponds to the C wire which is 24AC common power. The L wire is a system monitor and used to light a light on the thermostat – not used on the Filtrete (TM) Thermostat from 3M. The T wire is an external temperature sensor and is not used with the Filtrete (TM) Thermostat from 3M. So they can be taped off and put in the wall.


I am not sure if I have a C wire. How do I determine if I do?

There are two ways to determine if you have a “C” or common wire. 1) If there is a wire hooked up to the “C” terminal on the old thermostat, hook it up to the new thermostat on the C terminal. 2) If you have a spare wire in the wall you can go to the connector panel at the furnace/air handler end and check for a “C”, 24VC, or common connector and connect the extra wire to there and then to the “C” on the Filtrete (TM) Thermostat from 3M. (Sometimes the C wire is also labeled different for example it may an X wire depending on the manufacture of the system/thermostat.) If your system is a Trane or American Standard, connect their B wire to the new thermostats C terminal.)


Can my thermostat be used on batteries as well as 24VAC from the heater?

Yes, Filtrete (TM) Thermostat from 3Ms will operate on batteries and 24 volts AC. The 24 volts AC common will be connected to the “C” connector. The batteries will last significantly longer using both the 24 Volts AC from the system along with the batteries. An added advantage to using batteries along with having a “C” wire is that the batteries will keep the programming if you should lose house power.



C Wire Installation

The C wire stands for COMMOM and originates from the common side of the 24 VAC transformer. The R/RH wire coming up to the thermostat is one side of the 24VAC transformer. The other side of the transformer goes to the HEAT relay, the COMPRESSOR relay, and the FAN relay, hence the expression "common" wire.

Generally, this connection is indicated with "C", "comm." Or "24VAC" wherever the rest of the thermostat wires connect at the furnace. Sometimes it is directly available at the transformer on older systems. All 24VAC systems by definition have the common side of the transformer. Finding and connecting to it takes a qualified HVAC repairman as there are lethal (115AC) voltages in the furnace. We cannot recommend you doing the connection yourself. That is why we say "if there is a C wire, connect it". The C wire is not necessary for most mechanical thermostats so seldom brought up.

Once the C connection is located, if you have an extra wire in the cable going to the thermostat, you could use it for the C wire. If not, a new wire would have to be put in.

2nd Transformer:

If the 24VAC common wire (C) is not available at the thermostat, any external 24VAC plug-in adapter can be connected to run the thermostat.

The Radio Shack part number 273-1690 for around $15.99 can be used with its switch in the 24V position. Another 24 volt transformer you can use is a Rain Bird replacement power adaptor UT1 Home Depot part number #26C06505.Cut off the connector and strip the wires as shown in the picture. Then connect the wires to RH and C. There is no polarity; either wire can go to either terminal (RH or C).

Transformer rating is 24 volts AC at 300 to 500 mili-amps



My old thermostat had an anticipator adjustment. Where is it on yours?

Filtrete (TM) Thermostat from 3Ms do not require an anticipator adjustment because it is an electronic thermostat. Electronic thermostats typically use temperature sensing devices called thermistors which are very small, with almost no thermal mass. These devices track the air temperature very well so no anticipator is necessary. Filtrete (TM) Thermostat from 3Ms are specified and checked at +/- 1F accuracy.
Operation

How long do the batteries last?

All of the Filtrete (TM) Thermostat from 3Ms run on batteries with an optional C wire (24Vac) to provide power to the thermostat so it will run. If you are using a good quality brand of alkaline batteries they will typically operate the thermostat for aproximatly 12 months. Therefore they should be replaced regularly once a year or whenever the low battery indicator appears. If you are using lesser quality brand batteries, more frequent replacement may be needed.

What does the red blinking light mean?

On some of the Filtrete (TM) Thermostat from 3Ms there is a Red light that will blink when the batteries get low. If you see a blinking red light please change the batteries on your thermostat with a new set of alkaline batteries they will be ether a pair of AA or AAA batteries depending on the thermostat model.


What does the half full battery icon mean?

On the Filtrete (TM) Thermostat from 3Ms with a digital display a half full battery icon will be displayed when the batteries get low. If you see a half full battery icon please change the batteries on your thermostat with a new set of alkaline batteries they will be ether a pair of AA or AAA batteries depending on the thermostat model.


Can I use rechargeable batteries in the Filtrete (TM) Thermostat from 3M?

No, Filtrete (TM) Thermostat from 3Ms run on 3 Volts (2 x 1.5 volt batteries), and the “Battery Low” indicator comes on at about 2.6 volts. The thermostat stops working at about 2.5 Volts. Two AA or AAA rechargeable batteries only put out 2.2 volts, which means that there maximum power level is too low to operate the thermostat.

The thermostat is blinking between time and temperature how can I stop this?

There is no way to stop the unit from showing both the time and the temperature.

When in calibration mode what does the T-FACTOR on my thermostat mean?

The (delta sign) T-FACTOR that appears on some of the thermostat during calibration mode means the change in the room temperature setting when you “calibrate” the room temperature to your liking. When you change the room temperature with the “calibration” function, the display shows you both the new room temperature and the T-FACTOR which is how much you changed the room temperature by.

Troubleshooting

Why doesn’t the remote work on my Filtrete (TM) Thermostat from 3M?

Make sure both the thermostat and the remote are on the same channel. Also some channels work better than others depending on your situation.

If you do not have a C wire connected to the thermostat the remote will not function. If you do have a C wire connected it may not be working correctly. To test to see if the C wire is working, remove the batteries from the thermostat and see if it still functions. If not the C wire is not working.

If you need to install a C wire, please see FAQ: “How to install a C wire?”


I installed a new thermostat and my heating and/or cooling does not come on. Why?

If your unit has a fan, move the fan switch to the “on” position to see if the fan turns on. If it does not turn on, you may not be getting power to the thermostat. If the fan does not come on then check to make sure the wires are making good contact. See FAQ: “How to prepare wires for the thermostat?”

Also check to make sure you have a good set of batteries in the unit. Make sure the unit is calling for ether heat or cool. When it is calling for heat or cool the word heat or cool will be flashing. This means the heat/cool should be running.

For more help please contact support at 888-607-5824 or email filtrete@radiothermostat.com


I installed a new thermostat and my system is running continuously. Why?

There could be several reasons for this:
• It may be a wiring issue.
• The batteries may not be good.
• Is the thermostat calling for heat or cool? You can tell if it is calling by the word heat or cool will be blinking.
• Does the heat or AC turn off if you move the mode switch to the off positionand the fan switch to the “auto” prosition? If not does it turn off when you remove the RH and/or RC wires? If the system still continues to run, there is either a problem with the wiring to the heating and or cooling system or an issue with the HVAC system itself. If that is the case, turn off the power to your system.
For more help please contact support at 888-607-5824 or email filtrete@radiothermostat.com


Why does the temperature fluctuate uncomfortably with my new thermostat?

This may be caused by what is called swing. Swing turns on and off the system 1 or more degrees on either side of the set temperature so the system will not cycle as often and save energy and extends the life of your system. You can change the swing on the entire 3M Filtrete programmable thermostat line by changing the swing setting to a smaller value. The temperature will then be more even by cycling the furnace more often. On non-programmable thermostats the swing is fixed to one degree on either side or the set temperature.


The room temperature reading appears to be incorrect. Why?

If you just installed or programmed the unit the temperature reading may be off and is most likely reading high. The thermostat has picked up heat from you touching the unit. It could take several hours to settle in. If after several hours if the temperature is still off and you unit has a digital display you can calibrate the unit. See operation manual for how to calibrate your specific thermostat to match your desires.


The thermostat occasionally resets to factory setting. What could be causing this?

In most cases the reason the unit is resetting is there is some type of RF interference. This is most common with spark igniter furnaces but could come for other sourced like static electric air cleaners etc. One of the ways to filter RF interference is with a ferrite choke. You may have seen them on power cables to your computer, or printer or on interface cables. This usually solves the problem.

The Radio Shack Ferrite Data-Line Filter (273-105) is a round, in-line, snap on device that must be snapped around ALL the leads coming out of the wall (if there is enough room). If that does not completely solve the problem, or if there is not enough room at the thermostat, put a filter on the thermostat wires as close as possible to the furnace.
If the wires are long enough, an even better ferrite filter is the rectangular, Radio Shack snap on RF Choke (273-104). This one’s hole is large enough to loop the thermostat cable through it at least twice (if there is enough wire). The more loops the better but even one will help. This comes two ferrite cores in a package so one filter can be put at the thermostat and the other filter at the furnace. Once installed, the ferrite cores must be shut tight and be latched to be effective.

My thermostat is not responding to input since it received a static shock. What can I do?

All electronics are susceptible to static shock. It minimize static please ground yourself (touch something else before you touch the thermostat) or preferably if your unit has a stylus use it. Since the unit is not responding please try the following to remedy the situation. Please take the batteries out of the unit and remove the C wire if available for 15 minutes. Then put a new set of alkaline batteries back into the unit and re-install the C wire if available, Next reset the thermostat and try it again.


My heat is shutting down before it reaches temperature?

This could be ether a heater/furnace issue or a thermostat issue. One thing to check is your air filter, to make sure it is clean or replace it with a new one. Then try the system again. For further tests please contact support at 888-607-5824 or filtrete@radiothermostat.com


Why does the room temperature take so long to respond?

It may be on a wall that is ether very cold or warm and it is picking up the temperature from the wall. Try remounting it with the standoffs do the unit can get better air flow.


Why does the thermostat change settings by itself?

If you have a programmable thermostat and you override the setting by using the up and down temperature buttons. The thermostat will revert to the program at the next program time setting. When you have changed the program setting this way the thermostat will say “temp” or “override”. If you want to keep a specific temperature and not used the program, you will need to put the unit in a manual mode by activating the “hold” button. See operation manual for your thermostat on how to put the unit in hold.


My unit is blinking the word heat. What does this mean?

When the thermostat is blinking the word “heat” it means the thermostat is calling for heat and your heat should be running.

My unit is blinking the word cool. What does this mean?

When the thermostat is blinking the word cool it means the thermostat is calling for Cool and your Air conditioning should be running.


The heat /cool worked before but is not working now. What should I check?

• Make sure you have a good set of batteries in the thermostat. Please us a good set of name brand batteries (do not use rechargeable batteries).
• Reset the thermostat.
• Make sure all the breakers and fuses to your HVAC are good
• If you have a fan, see if the fan will turn on in the fan “on” position (If the fan does not come on the problem may be elsewhere in the system)
• Check for loose or broken wires

 
 
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