Heat Pump Failing

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  #1  
Old 01-22-16, 11:22 AM
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Heat Pump Failing

I got a Tech called and scheduled but he is several days out. My auxiliary heat is running fine so it is not urgent. I was just curious as to what a possible cause would be.

The problem.

About 5 seconds after the heat pump turning on the breaker will blow. I figured the thermostat was calling for heat, the head pump would then fire up and then the breaker would pop. I read all the possibilities and they all make sense to me; however, there is 1 issue.

The issue..... I turned off all 3 breakers (2 Indoor and the 1 AC(heatpump)) and pulled the inline outside guaranteeing no power to the unit. I then went back in and turned on ONLY THE AC BREAKER.

The breaker did not pop. This leads me to believe the breaker and internal wiring to it is fine. So I walk back outside and put in the inline. (Note, I still have the power to the 2 Furnace breakers OFF so the thermostat has no power.) The heat pump fan and compressor actually start to fire up. Once the fan gets up to speed the breaker pops.

Why would the heat pump try to fire up if the thermostat is not calling for it and is actually disconnected?

Thanks.

Obviously, I am not an HVAC tech and don't plan on working on it myself but I am curious as to why this is happening.
 
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Old 01-22-16, 11:33 AM
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If the wiring is correct then this shouldn't happen. Your contactor might be stuck in the closed position.
 
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Old 01-22-16, 11:43 AM
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Yeah that is what has me confused.

Im not an HVAC person but I've work on circuit boards/computers for 15 years now. So problem solving/trouble shooting/direction following comes fairly easy.

I just couldn't/can't wrap my head around why the unit would try to start up if nothing is calling for it to start up.

Easiest way to see if the contactor is stuck. Also, this is for heat not cool.

Just doesn't make sense to me.
 
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Old 01-22-16, 01:12 PM
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Pull the disconnect on the outside unit. Push the plunger in on the contactor with a screwdriver.Name:  contactor 1.jpg
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