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Old 01-11-2010, 10:43 AM   #1
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Bizarre Heat Pump and Blower Behavior


I am in central Florida and we have obviously had a snap of cold weather with last night being the coldest. My heat pump and auxiliary strips have been working fine until late yesterday afternoon when issues started. The heat pump outside would kick on when the termperature reached 1 degree below the set point as usual, but the blower would not come on. It would remain like that even when the temperature dropped 2 degrees below the set point. Then if I raise the set point 4 degrees above the temperature the auxiliary heat comes on and the blower starts up like it normally does if I do that.

So, in summary the blower wouldn't come on even though I could hear the heat pump come on but when auxiliary kicks in the blower works fine.

Now that things have warmed up outside everything is working normally again. Any ideas? Thanks!

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Old 01-11-2010, 10:54 AM   #2
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Bizarre Heat Pump and Blower Behavior


Your unit may have been in defrost mode. Some units will not run the blower in defrost unless the temp of the coil is too cold.

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Old 01-11-2010, 11:16 AM   #3
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Bizarre Heat Pump and Blower Behavior


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Originally Posted by H. Phillips View Post
Your unit may have been in defrost mode. Some units will not run the blower in defrost unless the temp of the coil is too cold.
Thanks. I was thinking it might be a defrost or lockout, but the issues started happening when it was still around 32 degrees. The fan on the outside heat pump shouldn't even turn on in either defrost or lockout should it?
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Old 01-11-2010, 04:32 PM   #4
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Bizarre Heat Pump and Blower Behavior


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Originally Posted by gatorinsc View Post
Thanks. I was thinking it might be a defrost or lockout, but the issues started happening when it was still around 32 degrees. The fan on the outside heat pump shouldn't even turn on in either defrost or lockout should it?
No, the outdoor fan doesn't run during defrost.

You may have an outdoor stat to prevent aux heat unless it is needed. Or wired to lock out the heat pump. And that may be wired up incorrectly.
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