Why Do Thermostat Displays Shut Off?
The screen on your thermostat is meant to display information about the thermostat's function and settings. So long as the thermostat has power, it should remain on. If the display goes blank, it's telling you that your thermostat has lost power.
How to check for a loss of power to your thermostat
If your thermostat takes batteries, you may see a panel or battery compartment that opens. Open the panel and insert new batteries. Some thermostats need to be removed from the wall-mounted backplate to access the batteries at the rear. Replace the batteries with fresh ones and put the thermostat back in place. Is the display back on?
Check to see if the breaker has tripped or the power switch is off. Heating and cooling systems use a 24 volt transformer to supply low voltage power to the thermostat. If the heating and cooling unit circuit is off, the transformer will be off, and so will power to your thermostat.
There should be a power plug attached to the condensate pump. Make sure the power plug is plugged into an outlet.
Also check to see if the outlet is a GFCI type (a GFCI outlet has test and reset buttons). The GFCI outlet may need to be reset by pushing firmly on the reset button. You can also check power to the outlet by plugging something else into the outlet to test its operation.
If the heating and cooling system is still not working, check for water in the safety overflow pan, often located under the indoor HVAC unit.
The overflow pan is there to catch water should the drain become clogged. The pan has an overflow switch that will stop the system from operating to limit damage to your property and make you aware of a developing problem. However, if the system is switched off, so will the power to your thermostat.
If these steps did not restore power to the thermostat, a technician is needed. They will have the proper tools and knowledge to correct the issue.
If these steps didn't help, you can troubleshoot some other likely causes.
What To Do If Your Thermostat Has Lost Power?
Because there are a few reasons your thermostat may have lost power, there are a few things you can do to try and fix it. Start by attempting to reset your circuit breaker, and if that doesn't work, try changing the batteries in your thermostat.
If neither of those fixes do the trick, then you likely have a bigger issue on your hands that will require professional assistance.
NOTE: This content is for informational purposes only, and HomeX and its affiliates disclaim all liability related to it. If you decide to perform any tasks based on this information, you assume all risks, including the risk of loss or damage to property or personal injury.
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