Heat Pump Not Heating in Winter
Common Symptoms
Heat pump blowing cool air in heating mode
House not warming up
Outdoor unit not defrosting
Auxiliary heat running constantly
Ice buildup on outdoor unit
Possible Causes
Several factors can contribute to this problem. Understanding the cause helps determine the right solution.
1Reversing valve stuck or failed
2Defrost cycle malfunction
3Low refrigerant
4Outdoor unit iced over
5Thermostat set incorrectly
6Compressor issues
7Auxiliary heat failure
What You Can Check First
Before calling a technician, try these simple checks that may resolve the issue.
1
Verify thermostat is set to 'heat' mode
2
Check that outdoor unit is running
3
Look for excessive ice on outdoor unit
4
Check air filter
5
Verify auxiliary/emergency heat works
When to Call a Professional
Outdoor unit completely iced over
Defrost cycle not running
Reversing valve suspected
Refrigerant leak suspected
Auxiliary heat not working either
Experiencing any of these situations?
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