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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My daughter has the problem of the thermostat not light. There

Customer Question

My daughter has the problem of the thermostat not light. There is a switch on the stat to control the fan auto or mode. When she switches the fan to auto it does come on leading one to believe that in some sense the thermostat is functioning. It stopped working today after a power outage; my daughter changed the battery and also went to the breaker panel switching the designated switch off and on more than once and then used the master switch. No result the thermostat is not functional. it controls a heat pump. Sorry I have none of the specs or model numbers. I was inquiring online to see what I might find as she called me - we live more than 100 miles apart,
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Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.
Tell me exactly what is happening. What do you mean by thermostat not light?
Customer: replied 1 year ago.
Was lighting showing temp, mode etc. not lighting or functioning. No display lighted or visible - was lighted & visible earlier. That is why she tried changing batteries/switching breakers. Stat appears to be "dead" - non-functional. There was a large power interruption the same day - power went out in house. Power returned & all else is functional in house except stat. Is that clearer?
Expert:  airheatman replied 1 year ago.
Yes, Thanks. Now you say that on auto the fan work, right? And does heat or ac work?
Customer: replied 1 year ago.
No! No heat/AC
Expert:  airheatman replied 1 year ago.
OK very likely thermostat is not getting power from furnace or it could have taken a power spike.Does she have a volt meter to do some troubleshooting as I guide?
Customer: replied 1 year ago.
Don't think so but seems logical that perhaps a spike wiped it out as it was functioning earlier in day. Is it possible the fan auto switch could be operable if the stat is blown tho?
Expert:  airheatman replied 1 year ago.
Yes, thermostat could be allowing a voltage bleed to tell fan to come on.If she wants to run to Walmart and pick up a meter or another thermostat,I will be happy to guide in troubleshooting or replacing.
Customer: replied 1 year ago.
That's a great idea. I will be going there two days from now. How could I reconnect with you Saturday afternoon day & receive your guidance?
Expert:  airheatman replied 1 year ago.
After rating answer you can follow up for 30days at no additional costs by just going to "My Questions"