Heat pump blows cold air briefly

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Old 02-23-19, 08:57 AM
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Heat pump blows cold air briefly

We moved recently to a home in Arizona with a heat pump. Itís been cold here and the heat has been working fine, but this morning we noticed that for about 15 minutes the hot air was replaced with cold air. And the interior temp actually went down one degree. But now itís blowing hot again and seems to be working. Any ideas on this one?
 
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Old 02-23-19, 09:56 AM
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Most likely the defrost cycle kicking in. The system runs in reverse (cooling) to heat up the outside coils to melt any ice/frost. Normally when this happens the aux heat coils turn on to keep you warm. Next time it happens verify that the outside unit is still running. You may not have a heat kit installed in the air handler or it may not be working.
 
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Old 02-23-19, 10:09 AM
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The outside unit was running and the blower was producing ice cold air in the house for about 10 minutes or so. But we had a lot of rain followed by unusually cold temps and there could have been icing. It’s fine now. I have no idea if we have a heat kit. We didn’t buy the unit. It’s a Trane from 2011.
 
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Old 02-23-19, 10:42 AM
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So system likely running as designed. Next time you have a tech out to service (clean the coils) you should ask them.

Take a look at the air handler. Lots of times there is a sheet attached that shows what heat kit is installed. Some list a bunch of sizes where the installer is to mark what heat kit was installed. Lots of times they don't mark it though. Other thing is to look at electrical circuit breaker on unit. If none there or only 20 amps you likely don't have one.
 
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Old 02-23-19, 10:53 AM
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I will check. Thanks for the advice.
 
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