The thermostat is in a different circuit than the circuit breaker.
Thermostat circuit breaker.
At your electrical panel turn the ac circuit breaker switch to the on position.
Turn the thermostat back on after 30 minutes check to see what your thermostat is set to.
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Remove the thermostat and take out the 2aaa batteries from it.
If the breaker is tripping it is because of a motor or compressor in the high voltage side.
Wait 30 minutes with the air conditioner off.
The circuit breaker tripped.
Then you have to test the thermostat by turning the breaker to the on position.
You have to check the circuit breaker first and then try to switch the breaker to the off position.
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Take a look at your circuit breaker and see if it needs to be reset.
If the circuit breaker trips it may shut off the power to your thermostat clearing the screen.
You get to sit back watch some tv make lemonade or do something else relaxing until the next step.
This can t happen if the thermostat is signaling for cooling.
It looks like the large 50a 2 pole breaker does control the outside ac unit but doesn t affect the heat or the fan.
Thanks for the comments.
Some thermostats are on the same breaker as other devices that draw too much power like a hair dryer for example.
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Put the battery in opposite direction the negative side is placed to positive and positive side is placed to negative.
This can cause the circuit breaker to trip which will shut your thermostat off.
I ended up walking through the breakers to find a 15a 1 pole breaker that stopped the fan and shut off the thermostat.
Put the battering again the right way.
Wait for 5 10 seconds and take the batteries out.
If the thermostat has an issue it blows a small transformer or fuse in the blower unit.
If this is the case fixing this problem requires nothing more than flipping the circuit breaker switch.
Be sure that the thermostat remains off so that your air conditioner s internal circuit breaker can reset.
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Commonly the circuit breaker is tripped.
Now go to the circuit breaker and switch it off.
If the thermostat is working normally just like before it means there is nothing to worry about.