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Heat pump never shuts off, runs all the time:
If you are experiencing this problem in the cooling mode during the summer, you should probably call for service. This is mostly a winter-time heating complaint.
Just like the previous complaint of the heat pump blowing cold air, sometimes the customer just thinks it runs all the time because they aren't used to a heat pump and how they work. In extremely cold weather, a properly working heat pump will run almost continuously. That is the way they were designed to work.
Now, if it isn't extremely cold and suddenly your heat pump just seems to run all the time, this indicates a problem. Along with this usually comes a high electric bill, lower supply temperatures, and sometimes icing of the outdoor unit.
Below is a list of possible causes. Items in blue usually require a service call. Items in red however can be addressed, even fixed by the homeowner.
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Outdoor unit iced-up - weather related
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Leaves, debris, or snow against outdoor unit
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Outdoor unit not running
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Thermostat set too low
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Cold return temperatures - example: air handler in attic and the return trunk disconnected from unit, pulling in cold attic air. Unit in basement with a basement return and open windows or a flapping dog door stuck open.
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Return duct leakage
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Poorly insulated house, air leaks (big problem for heat pumps)
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Undersized equipment and/or ductwork
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Improper refrigerant charge
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Refrigerant flow-related problem - restriction/bad metering device
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Poor efficiency- needs cleaning and servicing (bi-annual servicing are recommended – ask about our “Energy Savings Agreement”)
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Bad reversing valve
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Bad compressor valves
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Compressor not running
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Running in A/C mode
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Outdoor unit iced-up because of a malfunction
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Back-up strip heat not working
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