A/c electrics help

[warrington]

Three nights ago our thermostat went out. I’ll checked the breakers they were all on. The thermostat does not have batteries and it is hardwired with a blue common wire. It has five strands of wire. I read on YouTube how to replace it. My wife bought a ring thermometer and we hooked it up as shown. Turn the breakers back on and it still does not light up.

How would I test if I’m getting power to the the thermostat.

Any other ideas?


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[tx_basser]

after having a similar problem about 15 years ago with a thermostat problem I decided to try and always purchase the same model/make of thermostat I was replacing. Even to the point of buying one on ebay so I did not have to deal with a similar scenario.

[dpg481]

You make want to take a look at the outside unit to see if the wire was damaged.

[RDT]

Some heat units have a glass fuse on the low voltage side of
transformer

[thegrouse]

With the thermostat removed you can check from the R to the G terminals. Should have 24VAC. Normally the thermostat has a base that has the terminals and a front that has the display that screws or snaps to the base. There is a transformer generally in your indoor unit that powers the thermostat.