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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I had a new outside a/c unit with heat pump and inside heat

Customer Question

i had a new outside a/c unit with heat pump and inside heat unit installed about 1 year ago , about two weeks after it was installed the new thermostat went out and now it has gone out again any ideals what is the cause
Submitted: 12 days ago.
Category: HVAC
Expert:  Airheatman replied 12 days ago.

What do you mean by thermostat went out? Is thermostat completely defective and inoperable or dies screen go blank and come back on?

Customer: replied 12 days ago.
defective and inoperable
Expert:  Airheatman replied 12 days ago.

Sounds like there could be an issue such as power spikes taking thermostat out. Did all functions seem to work properly after they replaced the first time?What is model on thermostat?

Customer: replied 12 days ago.
what is a power spike is that like a surge ? if so can out dated wiring to the heating unit cause that ? also would it make a difference if the thermostat was powered by a battery ? it is a honeywell
Expert:  Airheatman replied 12 days ago.

A power spike is what happens when you notice your lights get brighter for a second or two. Transformer from utility company jumps above the normal 120v per leg of power.

Only way I can think of wiring would effect it is if old and brittle and wires actually shorted together.

Battery or hard wired should not make a difference.

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