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Old 11-28-2010, 07:28 PM   #1
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electric heat pump issue


when turning inside thermostat on heat mode, the heat pump kicks on, heats to proper temp then outside fan kicks off, leaving system to run in an ongoing fan mode. we have to either adjust thermostat temp below its setting to make it kick off or switch thermostat to off mode and wait for system to kick off. any ideas why this could be happening?

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Old 11-29-2010, 04:37 AM   #2
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electric heat pump issue


Is the thermostat's fan switch in the "on" position? If so, set it to auto.

Could be a limit switch in the air handler is open.

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Old 11-29-2010, 09:00 AM   #3
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electric heat pump issue


Quote:
Originally Posted by beenthere View Post
Is the thermostat's fan switch in the "on" position? If so, set it to auto.

Could be a limit switch in the air handler is open.
Sounds like it could also be defrost mode and bad luck with your timing.. Are you sure it's not in defrost mode? What is your backup heat? Electric or gas?

Are you familiar with defrost mode? It basically runs the heatpump in reverse without the outdoor fan running, then after a while steam comes off the heatpump and the fan kicks back on.. Meanwhile the indoor blower is running, putting cool air over the indoor coils. The coils are actually getting cold inside so that heat can defrost the coils. It is running in AC mode to defrost the outdoor coils..


One way to check if you are going into defrost mode is to go out side and listen to the heat pump. If the compressor is running but the outdoor fan is not turning, you're in defrost mode. A lot of heat pumps this time of year go into defrost mode every 45 minutes or so to keep the coils from icing up.

Last edited by zootjeff; 11-29-2010 at 09:04 AM.
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Old 11-29-2010, 09:31 AM   #4
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electric heat pump issue


its in the T-Stat period.......
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Old 11-29-2010, 09:40 AM   #5
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electric heat pump issue


Gator, you have described "defrost mode".
It's been 31 years since I was in AC/Refri school. I forget, what determines the length of time a defrost cycle needs.
Last winter we had a cold day of rain. The temp was one degree above freezing. Seems like the heat pump at work went into defrost cycle way more than normal. The fan stopped turning. Finally we had to carefully remove the ice from the outside condensor because it was stopping the fan from rotating.
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