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Posted by on December 27, 2006, 8:32 am
> I have a lennox heat pump and heater unit all electric. A couple of
>days ago i noticed the indoor unit was making a humming sound. i turned
>down the thermostat and it stopped when the compressor stopped. I
>checked the filters and they were dirty but not clogged but I replaced
>them. just to be on the safe side i backed off the thermostat to get
>through the holiday. If i let the house cool down to about 65 i can
>turn the unit on and set the thermostat for 75. the aux heat comes on
>and will heat to about 70 and the it drops off and the heat pump kicks
>in.
Not an expert on heat pumps, but this doesn't sound right. Isn't the
aux heat supposed to work together with the heat pump, assuming the
outside temp isn;t too low? I don't think this is the real problem,
but it could be a thermostat settup issue that is costing you money by
relying more on aux heat than necessary.
>it still heats but after a few minuets the fan stops and the indoor
>unit just humms. once the compressor shuts off it stops . after a few
>min the unit will come back on and the whole procession starts over.
>the fan works fine with aux heat but after a few on the heat pump the
>humming starts. Please help
Can you identify what exactly is humming? And is the heat pump
providing heat, (without aux heat) or is it not working and just
humming?
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