Honeywell Thermostat Keeps Going Up To 85 Degrees [Causes + Fix]

Is your Honeywell thermostat  repeatedly going up to 85 degrees? Don’t sweat it! Our comprehensive troubleshooting guide has got you covered, with expert advice and practical solutions to get your thermostat back on track.

If your Honeywell thermostat keeps going up to 85 degrees this could be due a thermostat low battery or power interruption that could be causing the thermostat to reset to the default 85 degrees. You may also have an active program schedule that could be causing this behavior.

To fix this problem, check the status of the batteries. If the batteries are in great working condition, you might want to check the back of your thermostat for a reset to try and reset the whole thermostat. 

Alternatively you can  reset your thermostat by   removing the batteries from the unit or disconnecting  C wire from the unit for a minute. The unit may be bad and stuck but often a reset will work, most have a way to factory reset them if you have the model it will be in the manual as well.

Possible reasons a  honeywell thermostat keeps going  up to 85 degrees

Low BatteryReplace battery
Active program ScheduleUse hold function to override a schedule or clear schedules
Faulty wiringEnsure C wire is connected
Defective thermostatReplace thermostat

Read also: Braeburn Thermostat keeps Resetting To 85 [Fixed]

How to Troubleshoot a Honeywell Thermostat that Keeps Resetting to 85 Degrees.

If your Honeywell thermostat keeps going up to 85 degrees, there are a few troubleshooting steps you can take to diagnose and potentially fix the problem. Here are some steps you can try:

Check the Batteries

If your thermostat is running on batteries, check to see if they are low or dead. When the batteries are low, they could be providing intermittent power to your thermostat causing it to  reset to the default 85 degrees.

Replace the batteries if necessary and see if this resolves the issue.

Check the Settings

 Double-check the settings on your thermostat to make sure that there are no active programs or schedules.  When your thermostat is programmed  it i’ll change temperature on its own according to the schedules in place.

 That means that even when you manually set the temperature point, your thermostat will reset to the programmed temp at the next schedule.

Use the hold function on your thermostat to temporarily  override the schedule in place or reset your thermostat to completely do away with a schedule.

Check the Wiring

 Another issue that can cause your thermostat to change temperature on its own is loose thermostat  wiring. 

But before you open your thermostat to look at the wiring, always turn off the power to your heating or cooling system for  safety reasons. 

Check if  your thermostat is powered by batteries of a C-wire.  If it is  powered by  a c-wire ensure that it is tightly connected on the terminal and that its end is properly stripped at least half an inch to make a proper contact with the thermostat terminal.

 You can even give it a little tug Just make sure the c-wire is tight and properly connected contact with the terminal

Firmware glitch

Many times electronic devices can malfunction and a simple reset  is what can fix them. Same with thermostats, sometimes, resetting them can help to resolve issues with them. 

As I explained earlier, to reset your Honeywell thermostat you can use the reset button behind it or simply  remove batteries or disconnect  the c wire for a couple of minutes.

Defective thermostat

If none of the above troubleshooting tips works out it could be that perhaps your thermostat has served its purpose in your home and it’s time for a replacement. But you can not conclude it, give it another chance by calling Honeywell customer support for a second opinion.

Read also: White Rodgers Thermostat Keeps Resetting to 85 [Fixed]


Why does my Honeywell thermostat keep changing temperature on its own?

When your thermostat keeps changing temperature on its own, this could be due to  low batteries,  loose thermostat  wiring, intermittent power supply or active program schedules.

 Why does my Honeywell thermostat keep rebooting?

If your Honeywell thermostat keeps rebooting, it could also be due to a low battery, faulty wiring, or a malfunctioning thermostat. Check the batteries, wiring, and reset the thermostat to see if this helps.


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