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Honeywell Thermostat Won’t Turn On Heat ? (6 Fixes) 2023

honeywell thermostat heater not working

Thermostats are essential appliances used in homes, especially during extreme climate changes. These thermostats have made our lives easier, but some issues may concern you.

It can be highly frustrating if your thermostat stops working after a while. We are here to help you with some easy and possible solutions to fix your thermostat. We have already published a brief article on the Honeywell Thermostat screen not responding issue. This article will discuss troubleshooting, causes, and common problems with their solutions.


If you have set your thermostat on HEAT mode for quite some time, but it won’t warm up the room, there must be some issues. Unresponsive heating systems can be painful when it’s too cold. There can be many causes for a Honeywell heating not working. You need to figure out the problem and then use the solution to fix the heating issue. In this article, we will provide you with some repair tips that you can use to fix the no-heat issues.


Wiring your thermostat is one thing, and the presence of faulty wires is another. The first tip is to remove the thermostat case and check if the wiring is loose or connected to the wrong terminals. This can be a significant cause if the thermostat is not heating your room, even if it has new batteries. Rewire your thermostat before it damages your device.

honeywell thermostat flashing heat on but no heat

Use safe tools to fix the loose wires. Connect the cables to their respective terminals by matching the letters on the wires and terminals. Attach the case back again into the thermostat. I hope now your thermostat is heating the room properly.


Is your thermostat not reaching the set temperature? Another reason for a faulty heating system can be the thermostat temperature set too low. The room temperature must be the same as the temperature set on the thermostat for the heat to work.

honeywell thermostat heat on

For example, If your room temperature is set to 60 degrees, the thermostat’s temperate should also be 60 degrees. If both match, this is when your thermostat will start to draw the heat. If your room temperature is low, then the temperature is set. Check the thermostat’s temperature now.


Any electrical appliance needs a suitable power supply to function correctly. Your Honeywell Thermostat heater not working requires a 24V power connection for a sound temperature control system. If you have been using the same battery for your Honeywell Thermostat for too long now, your thermostat will have issues, like its heating system will stop working. The batteries usually run out of energy due to circuit breaks or power outages, which can be alarming. If your thermostat has old and drained-out batteries present then it’s display can also go blank.


STEP 1 – You need to turn off your thermostat from the circuit breaker
STEP 2 – Then remove the old batteries from your thermostat
STEP 3 – Insert the new reliable batteries in your thermostat
STEP 4 – Turn on your thermostat from the circuit breaker

This will fix your Honeywell heat not working issue. Replacing batteries is an easy way to save money and time.


Every thermostat draws out the heat from its furnace. You might think your furnace is ON but still not heating your room. It is because someone accidentally turned off the furnace. First of all, locate the circuit breaker in your thermostat device. If your thermostat is electrical, it will have a double-lever breaker; if it works with gas, it will likely have a single-lever breaker.

honeywell thermostat heat not working

Identify the circuit breaker, and turn on the furnace if it is off. Close the furnace door again because it won’t work if left open. Another reason can be a dirty flame sensor. If it is not cleaned, it will turn off the furnace. Clean your furnace flame sensor and tune it up for better results.


So you have turned on your thermostat when the room is cold but it is still not heating; why? Check the circuit breakers. Your thermostat is ON, but the circuit break might have tripped. Go to the panel and check the circuit. If the breaker has tripped, switch off the system on the thermostat. Reset the breaker and then turn ON the power switch of the heating system.


Every thermostat has a temperature sensor to control the room temperature automatically. After measuring the room temperature, the sensor activates the cooling/heating depending on the calculated temperature. If your thermostat sensor is faulty, it will show different readings on the display screen.

thermostat says heat on but furnace not running

To check whether the sensor is working or not, measure the room temperature and then see the reading on the screen. If both readings aren’t the same, your sensor is broken. Get a new temperature sensor for your Honeywell Thermostat. This will immediately fix the Honeywell heat won’t turn on issue.

FAQs Related to Honeywell Thermostat Heat Not Working:

Q: Why Should I Configure My Thermostat?
A: If you have bought a new Honeywell Thermostat and still its heating system is not working properly, it might not have been configured. To fix the heat issue, you need to reconfigure your Honeywell Thermostat.

Q: How Will I Know I Have A Reliable Thermostat?
A: Buy your thermostat from a reputable brand, and check its size, see if it controls your room temperature or shows correct readings on the display. If your thermostat fits best with your area, cools or heats the room, and the display screen functions well, then it is reliable.

Q: What Happens If The Heating System Short Cycles?
A: If the heating system in any thermostat short cycles, this means it has reached its control level. It will make a buzzing sound, or the motor will blow, which is an expensive heating repair.


This is how to turn ON the heating mode on Honeywell thermostat without calling any HVAC expert or technician. Try all troubleshooting steps, and if still it doesn’t work, reach out to the Honeywell Thermostat Customer SupportΒ for your help.

Change the batteries once every year, and check if the circuit breaker and furnace are ON. I hope all these repair tips will help you out. If none of these troubleshooting steps work for you, reset your Honeywell Thermostat using the expert’s guide. From our article, learn how to turn ON the Honeywell thermostat heat.

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