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. 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
- posted
17 years ago