Gree
Heat Pump Heating Failure
Indoor unit runs but no heating in HEAT mode; air remains cool or only slightly warm.
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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 coil failure or stuck valve, Low refrigerant charge, Outdoor coil heavily iced and not defrosting, Outdoor ambient sensor or coil sensor misreading
How to Fix / Troubleshooting
Safety first: Heat pump refrigerant components can be very hot or very cold. Do not touch bare copper lines.
- Step 1 – Verify mode and setpoint: Ensure the unit is in HEAT mode and the set temperature is above room temperature.
- Step 2 – Check outdoor unit in HEAT: In heating mode, the outdoor fan should run and the outdoor coil will be cold. If the outdoor unit does not run, note this.
- Step 3 – Inspect for heavy frost: If the outdoor coil is completely iced over and never defrosts, defrost control or sensors may be faulty.
- Step 4 – Listen for reversing valve change: When switching between COOL and HEAT, you should hear a brief whooshing sound from the outdoor unit. If not, the reversing valve may be stuck or its solenoid coil may have failed.
- Step 5 – Technician repair: A technician should test the reversing valve coil, defrost sensors, and refrigerant charge, and may need to replace the reversing valve assembly or sensors.
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Repair Difficulty
Professional Required
5/5
Required Part
Four-Way Reversing Valve
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