How to Fix Why Honeywell Thermostat Does Not Maintain Heat Setting

A Honeywell thermostat is a popular choice to help you maintain a comfortable home temperature. When your home drops below or rises above a certain set temperature, it triggers the heating or air conditioning to heat or cool your house. But if your Honeywell thermostat isn't maintaining its heat setting, it won't properly heat your home. Finding out why your Honeywell thermostat isn't working is key to solving the problem.

How to Fix Why Honeywell Thermostat Does Not Maintain Heat Setting
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How Can You Tell Your Thermostat Is Not Holding Temperature?

The main signifier that your Honeywell thermostat is reading the wrong temperature is that your house is colder than you have set it to be. You may also notice your Honeywell thermostat has a blinking screen when the heat is on, or that your thermostat seems to be powering on and off more than it should.

What Can Cause A Thermostat To Not Maintain A Heat Setting?

A Honeywell thermostat may be malfunctioning generally, and this is the cause of its inability to hold temperature. If your screen is blank and unresponsive, or flashing, it may mean your thermostat's batteries are dying. Try replacing them to see if it helps.

This could also be the cause of a loose or poorly attached wire. Using your thermostat manual (and making sure the power is turned off) you can check the connections of your thermostat's terminals and wires.

If your thermostat is not totally level, the mercury switch within it can cause the temperature readings to be wrong. If this is the case, you may notice your heating or air conditioning turning on and off more frequently than they should.

Dirt or debris within the thermostat can also cause problems. If your Honeywell thermostat isn't working properly, it's worth checking behind the cover and giving it a clean to see if that helps.

If your thermostat looks totally fine, the problem is likely with the sensor. If your sensor is broken, your Honeywell thermostat could be reading the wrong temperature in the room.

Honeywell Thermostat Troubleshooting

The first step to fixing your thermostat's heat setting is to press the "Up" arrow and the button which says "Switch to Permanent Hold." This will manually change the setting of your thermostat to a higher temperature than the outdoors.

Check the thermostat is set to heat, and see if the "Heat On" button is blinking. This indicates a safety timer has been tripped to protect your thermostat's compressor. Once this stops blinking, your thermostat should be able to maintain its heat setting again.

If you have checked the batteries, wires, level and debris, as well as the "Permanent Hold" and "Heat On" buttons, the problem is likely with your thermostat sensor. While sensors can be replaced, it is often more cost effective to simply replace your thermostat.


Annie Walton Doyle is a freelance writer based in Manchester, UK. Her work has appeared in The Huffington Post, The Daily Telegraph, Professional Photography Magazine, Bustle, Ravishly and more. When not writing, she enjoys pubs, knitting, nature and mysteries.

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