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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My thermastat is blank I have reset my circuit breakers

Customer Question

My thermastat is blank I have reset my circuit breakers although they were not tripped , taken it off wall and replaced , still no reading
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I think just the thermastste , all was good when I got hon
JA: Do you plan on doing the work yourself?
Customer: yes leaving on a plane in the morning
JA: Anything else we should know to help you best?
Customer: It worked when I got home even made it cooler , walked by and screen was blank
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

1. If it has batteries, replace them first.

2.If no batteries, we will move to the furnace and look for a small fuse that may be blown

3.Do you have a volt meter for troubleshooting?

Customer: replied 1 year ago.
Expert:  airheatman replied 1 year ago.

OK did you check and if it has batteries replace them?

Customer: replied 1 year ago.
There are no batteries
Expert:  airheatman replied 1 year ago.

OK do you have a gas furnace or electric air handler. Give me model on that unit

Customer: replied 1 year ago.
Electric trane model 2tfb3f24b1d05ba
Expert:  airheatman replied 1 year ago.

OK the air handler should have a little 3 or 5 amp fuse in the red wire coming from transformer that goes to R at control board and thermostat.Locate and check that fuse to see if it is blown.

Expert:  airheatman replied 1 year ago.

See below

Customer: replied 1 year ago.
I cannot find a fuse
Expert:  airheatman replied 1 year ago.

If you can not find a fuse we will need a meter to troubleshoot.

You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.

Otherwise it is going to be necessary to call in a tech with a meter

Customer: replied 1 year ago.
Is there a reset switch in side or outside
Expert:  airheatman replied 1 year ago.

There is not a reset as such. You could however have a float switch in your drain that is breaking the power to the thermostat if drain is backed up. Lets look and see if you have a float switch.If so lift it out of drain and see if we get power to thermostat