Heat Doesn't Stop Running


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Old 03-06-14, 02:31 PM
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Heat Doesn't Stop Running

I just noticed that the heat hasn't turned off all day. The thermostat just switches back and forth from heat to auxiliary heat.

I replaced the thermostat recently, with help from this forum: (thread is here)

If I turn the thermostat down to a temp below the room temp, the heat will shut off.

It's cold outside, but not cold enough to have the heat running non-stop.
 
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Old 03-06-14, 03:51 PM
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Your heat pump is not functioning properly.What is the outside temperature?
 
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Old 03-06-14, 05:53 PM
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Is the larger copper pipe that runs between the air handler and the heat pump getting hot with a heating demand?
 
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Old 03-06-14, 06:12 PM
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The large copper pipe at the inside unit is hot.

The daytime temp was low 40s, the nighttime temp is in the mid to low 20s.
 
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Old 03-07-14, 07:22 AM
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I kept the heat on emergency heat last night.

I went out to the heat pump this morning and noticed ice inside the unit at the base of the coil.
 
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Old 03-07-14, 08:29 AM
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I would get the heat pump running again. If it frost's up watch to see if the fan on top stops and the compressor keeps running. That means it is in defrost mode. If it does not go into defrost and you see ice, then the defrost module might be bad.
 
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Old 03-07-14, 08:59 AM
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THis may just be the way your thermostat works ... my previous (York) thermostat behaved exactly as you describe, which went like this:
-When the room temperature is 4 degrees or more below the thermostat set point, AUX is activated.
- When the room temperature reaches 2 degrees below the set point, AUX is deactivated

So when it's cold enough that the heat pump alone can't do the job without AUX help, the heat pump runs continuously and the AUX cycles on and off, but the set point is never reached and the room temperature sits between 2 and 4 degrees below set point.

My cure was to change the thermostat to one which, once AUX was activated (when room temp is 4 degrees below set point, or after 30 minutes of heat pump alone) , it stays activated until the set point is reached, and then both AUX and the heat pump (Y1 I think) go off together.
 
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Old 03-09-14, 04:28 PM
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Switched it back to heat and now it just runs. It's warmer today so it hasn't switched to auxiliary heat, but it keeps running. I tripped the breaker to see if a sensor would reset.

It began working correctly for a few hours, then back to running in heat mode.

I'm going to have to call in a professional I think.
 
 

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