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Old 01-01-2009, 12:43 PM   #1
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Heat Pump outside fan on/off every 5 seconds


I have a Carrier Heat Pump. When in heating mode, the thermostat clicks to turn the heat on, and the blower starts blowing. However, the outside unit starts spinning for about 5 seconds then clicks off for about 15 seconds. It repeats this cycle over and over. I hear a slight hissing noise or water flowing noise during the off cycles. Eventually, the aux heat kicks in and some heat is generated.

The airconditioner worked fine this summer.

Any suggestions as to what is going on here?

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Old 01-02-2009, 01:25 AM   #2
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Heat Pump outside fan on/off every 5 seconds


Check your air filter.

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Old 01-02-2009, 05:52 AM   #3
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Heat Pump outside fan on/off every 5 seconds


Is the interior of the outdoor machinery free of snow, ice, leaves, and debris?

Is the outside temperature cold enough that the system should be running on auxiliary heat?

One source mentions that if the system was deprived of power in winter (outage, breaker tripped, etc.), it should be set to auxiliary heat for several hours while the outdoor machinery and its lubricating oil is warmed (I suppose by another auxiliary heater).

Your system may need refrigerant recharging.

Last edited by AllanJ; 01-02-2009 at 06:05 AM.
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Old 01-02-2009, 11:54 AM   #4
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Heat Pump outside fan on/off every 5 seconds


Where are you located? What are the outdoor temps?

It is possible your unit has an outdoor thermostat and it has either gone bad or is right at the set point.

Otherwise, sounds like the system needs to be re-charged.
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Old 01-03-2009, 08:32 PM   #5
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Heat Pump outside fan on/off every 5 seconds


I am located in Atlanta, GA, so Aux Heat *should* not be on as we are well above freezing.

I had my HVAC guy come out and look at the system. His answer was that it was low on Freon and needed a recharge. The system was turning off due to a switch that apparently doesn't let the system run when it is that low on freon.

We charged it up and it is now working fine. We are going to be monitoring it to ensure that I don't have a serious leak. I am going to go out with some soap bubbles tomorrow and do some additional "leak detection" myself just to satisfy my on curiousity. I had a system at a previous house that I found several leaks that needed repair using soapy bubbles.

Thanks to all for your responses!!!! I am a newbie on this site, but appreciate all the patience and help.

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Old 01-03-2009, 08:42 PM   #6
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Heat Pump outside fan on/off every 5 seconds


WSB- check the indoor coil for your leak. Carrier is notorius for leaking indoor coils. You probably have several pin whole leaks. Hard to find without an electronic leak detector.

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