Have American Standard Alliegence 14, the heat pump thermostat sensor that connects to the freon discharge line of condensor arcs and blows fuse when turned on. I have tested the sensor and confirmed the short connection at ambient, along with measuring case to ensure not shorted to case. All checks out. My guess is the 40Amp 1-Pole Contactor 24V coil, contactor that the sensor plugs into is defective. Does this make sense? Would like to confirm before spending $70 on the contactor thank you very much.
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Has anyone had an occurrence of a Laser 730 or 731 over firing?
The top of the heat chamber and the heat exchanger glow red on high when this occurs....
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