Whynter
Heating Failure (Heat Pump or Electric Heater)
Unit in HEAT mode blows only cool or lukewarm air.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Reversing valve not shifting (heat pump models), Failed electric heater element, Faulty heat mode relay on PCB, Temperature sensor misreading
How to Fix / Troubleshooting
Safety: Unplug the unit. Heating components can be live and hot.
- Verify mode: Confirm HEAT mode is selected and the set temperature is above room temperature.
- Airflow: Clean filters and ensure vents are clear.
- Heat pump models: Listen for a change in compressor sound when switching between COOL and HEAT. If no change, the reversing valve coil may be faulty or not energized. This requires a technician.
- Electric heat models: Check continuity of the heater element and associated thermal fuses/limits. Replace any open components.
- Control board: If heater and sensors test good, the main control PCB may not be energizing the heater circuit and may need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Heater Element
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