Turn the thermostat back on after 30 minutes check to see what your thermostat is set to.
Thermostat circuit breaker.
Some thermostats are on the same breaker as other devices that draw too much power like a hair dryer for example.
If the thermostat has an issue it blows a small transformer or fuse in the blower unit.
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Depending on how your home is wired your thermostat may be on the same breaker as another appliance or device that draws a surplus of power hair dryer anyone.
Put the battering again the right way.
You get to sit back watch some tv make lemonade or do something else relaxing until the next step.
The circuit breaker tripped.
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This can cause the circuit breaker to trip which will shut your thermostat off.
Take a look at your circuit breaker and see if it needs to be reset.
The thermostat is in a different circuit than the circuit breaker.
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At your electrical panel turn the ac circuit breaker switch to the on position.
Then you have to test the thermostat by turning the breaker to the on position.
Thanks for the comments.
I ended up walking through the breakers to find a 15a 1 pole breaker that stopped the fan and shut off the thermostat.
Wait 30 minutes with the air conditioner off.
Now go to the circuit breaker and switch it off.
Remove the thermostat and take out the 2aaa batteries from it.
This can t happen if the thermostat is signaling for cooling.
You have to check the circuit breaker first and then try to switch the breaker to the off position.
It looks like the large 50a 2 pole breaker does control the outside ac unit but doesn t affect the heat or the fan.
If the breaker is tripping it is because of a motor or compressor in the high voltage side.
Switch off the thermostat.
Commonly the circuit breaker is tripped.
Put the battery in opposite direction the negative side is placed to positive and positive side is placed to negative.
Be sure that the thermostat remains off so that your air conditioner s internal circuit breaker can reset.
Wait for 5 10 seconds and take the batteries out.
If the circuit breaker trips it may shut off the power to your thermostat clearing the screen.