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Honeywell Thermostat Won’t Turn On Heat (Find Out Why)

Honeywell Thermostat Won’t Turn On Heat (Find Out Why)

The thermostats work 24/7, they are connected to your heating/cooling system. They maintain the temperature in your home, and you can change the temperature according to your preferences.

Well, as they work 24/7, they can sometimes run into issues like if the heat won’t turn on. If your Honeywell thermostat isn’t turning on the heat, then the reasons could be faulty sensors, improper installation, tripped circuit breakers, etc.

Now, another reason for your thermostat not to turn on the heat could be that the EM Heat on the Honeywell Thermostat gets activated in order to maintain the temperature.

Apart from that, you can also try resetting your thermostat. Well, if there is any bug or error, a factory reset should fix it.

If you want to know how you can reset your Honeywell thermostat, then keep on reading.

Why Honeywell Thermostat Won’t Turn On Heat?

A black screen of a thermostat showing the temperature
If you installed the thermostat by yourself, there might be chances of improper wiring, so have a professional look at your thermostat.

There is always more than one possibility of what could be causing an error. To fix an issue, you will have to try all the fixes in order to fix the issue and find out what caused it.

First, you need to check whether the breakers are on or not because sometimes the circuit can get shit and cause the breakers to turn off.

If that’s not the case, then check if the EM Heat on your thermostat is on or off. If the EM heat is on, the heat pump will bypass the standard operating process and only depend on the additional heat system.

Now, if you still can’t fix the issue, perhaps your device needs a reboot. Sometimes due to overheating or an error, some features stop working.

To reboot your Honeywell thermostat, turn off the thermostat, find the breaker that powers the HVAC system, turn it off, wait about 30 seconds, turn on the breaker, and then turn on the device.

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    This kind of reboot usually troubleshoots minor errors. However, if there’s any major issue with the firmware, then a factory reset should be considered.

    How to Reset The Honeywell Thermostat?

    A thermostat with blue screen showing the temperature
    Resetting your thermostat will solve most of the issues that you are facing. However, sometimes the breakers may have got turned off because of a shot circuit, so make sure that all the breakers are on considering a reset.

    Factory resets certainly get the job done. If you are facing any issues with your devices that aren’t getting fixed with updating or rebooting, then you should consider testing them.

    Now, there are different versions of Honeywell thermostats, which means there are different ways to reset them. Check out the table below to see which one works for your thermostat.

    Honeywell ThermostatReset Process
    ManuallyThe first step is to turn off the thermostat as well as the circuit breaker.
    Now, remove the front cover of the thermostat and remove the batteries.
    Put the batteries in opposite directions, i.e., the negative end of the battery will go on the positive side and vice versa.
    Wait for 5 to 10 seconds, remove the batteries again, and put them the proper way.
    Put the cover back on of the thermostat and turn it on, as well as the circuit breaker.
    There you have it, and your device has been reset.
    Using the buttonMake sure that your thermostat is on.
    Press the Program button three times.
    Now, find a paperclip to insert in the reset pinhole, which can be found on the front panel.
    Make sure to press the button for about 5 seconds, and your device should reset in a few minutes.
    How to reset different versions of the Honeywell thermostat.

    What Is Causing No Heat Issues on My Honeywell Thermostat?

    There could be more than one issue that could affect the heating feature on your Honeywell thermostat.

    HVAC systems on your thermostat have a circuit breaker, which basically prevents overloading and damage. If the circuit breakers are off, then your thermostat won’t pump any hot air.

    Thus, you need to make sure that these breakers are on. To do so, you will have to open the electrical panel and see whether the breaker is off; if so, then turn it on.

    In addition, the reason for this issue could be because the furnace door is open.

    Your thermostat won’t produce any heat as long as the furnace door is open. Close it and then turn on the heat mode.

    Replacing the sensor can also be a helpful option. If the sensor on your thermostat is broken, it won’t be able to sense the temperature of your room, and the heat feature won’t work.

    Lastly, you might have installed your thermostat improperly. If you performed the installation on your own, then it’s possible that there could be improper wiring. In this case, call a professional to check the wiring.

    Furthermore, another reason that might be causing your thermostat to not perform well could be that your device has been installed near a window, air vent, or any place with airflow.

    Your thermostat won’t be able to sense the temperature of the room because of the wind coming from the outside, which will result in poor performance and not heating or cooling the environment adequately.

    Make sure that your thermostat is set to the temperature that you want.

    What Is Heat Mode On Thermostat?

    A thermostat showing temperature on blue screen
    Heat Mode turns on automatically by your thermostat when the temperature drops in the room.

    Your thermostat connects to the heater or the furnace, and when the temperature takes a dip, your thermostat will turn on the heater/furnace.

    However, you first have to set up a temperature that you want for the room, so whenever the room isn’t at the preferred temperature, your thermostat will sense it and turn on the heating source.

    The same goes for cool mode on your thermostat. However, instead of the heater or the furnace, it will be connected to the AC.


    How Do I Switch From AC to Heat?

    Since thermostats are created for this task, meaning you don’t have to do everything by yourself. From everything, I mean that you don’t have to turn on the AC when the temperature goes up and turn off the heater when the temperature goes down.

    We all know that in some countries, the temperature changes every hour. So, it can be a challenging task to turn on and off your AC and heater.

    Well, to save you from this trouble, all you have to do is set your thermostat to a temperature that suits you, and your thermostat will make sure to maintain that temperature by turning on and off the sources.

    Check out this video to see why your thermostat isn’t turning on heat and how you can fix it:


    • If the heat mode on your Honeywell thermostat isn’t working, perhaps there’s a faulty sensor, improper installation, or a tripped circuit breaker.
    • Sometimes the circuit can get shot, and as a result, the breakers may turn off.
    • HVAC systems on your thermostat have a circuit breaker that prevents overloading and damage. Thus if the circuit breakers are off, your thermostat won’t pump any hot air.
    • In addition, your thermostat won’t turn on the furnace as long as the door is open.
    • Another reason for your thermostat to pump any heat could be because of improper wiring.
    • Moreover, make sure that your thermostat isn’t located beside a window, door, or vent because the outside wind can give the thermostat a different sense of the temperature of the environment.
    • Your thermostat connects to the heater or the furnace, which are the heat sources, while the AC is cooling.
    • So, when the temperature drops, your thermostat will turn on the theater, and if the temperature rises, it will turn on the AC.

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