Originally Posted by davidderrickson
My compressor (2006 Bryant) outside will not come when I set the thermostat lower then the room temperature.
I replace the contact switch as a guess but still doesn't work.
I can manually start the compressor (will cool the house) by pushing in the contact switch but once I let go the switch comes back out.
Question is: why is the contact switch no being tripped? Is it the capacitor or the circuit board?
The low voltage circuit energizes(closes) the contactor.
This is done when the thermostat calls for cooling the coil of the contactor is what causes it to close.
Possibleities are bad thermostat or bad step-down transformer.(220v-24v)