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Old 06-12-2020, 11:09 PM   #1
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Heat Pump Running after AC Turned Off


I decided to turn off the AC tonight and 20+ minutes later I realized that the heat pump was still running. I checked with my father to see if that's normal, he said it would run for a while because of built up gas. I usually never turn it off while it's still running, but I was tired of waiting. It's been almost an hour, I think something is wrong.

Any thoughts on this? I believe it's a Trane heat pump and it's about 33 years old, still with the old analog thermostat. I think it was last serviced around 2011, give or take a year.
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Old 06-13-2020, 08:10 AM   #2
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Re: Heat Pump Running after AC Turned Off


No, it should shut off once the thermostat reaches setpoint or the thermostat is turned off.
There is no “built up gas”.
The contactor could be stuck closed. Or the thermostat or wiring could be shorted.
Check the contactor and test for a cooling call with your meter.
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Old 06-20-2020, 03:38 PM   #3
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Re: Heat Pump Running after AC Turned Off


The outside unit stopped running after 45-60 min. Then something else came up (washing machine broke) and I stupidly never followed up on this issue.


I just went to turn the AC on and nothing is happening. I changed the temperature setting and it's still not coming on.


What should I check, the same things as mentioned above?

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Old 06-20-2020, 04:16 PM   #4
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Re: Heat Pump Running after AC Turned Off


Yes, but start by checking line voltage and work your way in.
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Old 06-21-2020, 01:57 PM   #5
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Re: Heat Pump Running after AC Turned Off


I'd check if the contactor is pulled in when the thermostat is calling for cooling.
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Old 06-22-2020, 08:29 AM   #6
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Re: Heat Pump Running after AC Turned Off


Easy things first, replace the battery in the thermostat.

Based on your earlier problem of failure to shut down, I suspect something is wrong in the thermostat or its wiring. Often the control wire gets gnawed on by squirrels or chipmunks and troubles like this happen. If so, it can eventually get shorted and blow the fuse in the 24 volt control circuit.
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Old 06-23-2020, 04:34 PM   #7
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Re: Heat Pump Running after AC Turned Off


I ended up calling my dad to check it out because I have no clue what any of this stuff is and he does. He ended up calling an HVAC repair company. I have no idea what happened because I was at the dentist when the repair guy was here.


All I know is that now it's worse. The heat pump still isn't cutting off, but neither is the inside unit (the fan and all that stuff). Plus, now it's also not cooling properly. The repair guy wasn't sure if it was fixed. And apparently the heat pump had also iced up before he got here. It appears to be dehumidifying the air, but I can't be certain.

I may need a new system. I don't know.

Question: If I have to get a new heat pump I know I'll have to get a new thermostat because mine is still analog not digital. What else would need replacing? Would they need access to the lines that run from the inside unit (where the fan is) to the heat pump? My basement is a total wreck right now so access to certain areas/ things is limited.
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Old 06-23-2020, 04:59 PM   #8
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Re: Heat Pump Running after AC Turned Off


We can't see what they will be replacing, so hard to say.


But they will need access to all areas the equipment is in.
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Old 06-23-2020, 05:45 PM   #9
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Re: Heat Pump Running after AC Turned Off


I’d get a second opinion from someone that can explain exactly what’s wrong. Rather then tell you they don’t know if it’s fixed and that you need a new unit.
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Old 07-03-2020, 02:52 AM   #10
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Re: Heat Pump Running after AC Turned Off


nice post
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