I have a 300A on my new trane heat pump. The 300A does not come on. The light inside the plastic control chassis is always on. The sensor voltage from the outside sensor measures about 4 volts dc. The installer says the outside sensor is a humidistat. I thought it was supposed to be a thermostat. The 300a does not come on , even in the test position.

Asked by Bob on 11/14/2008 1  Answer

ManualsOnline posted an answer 15 years, 4 months ago

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