Sharp Defrost Cycle Malfunction

Outdoor unit coil heavily frosts over in heating mode and does not defrost properly.

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.

Possible Causes

Faulty outdoor coil thermistor, Defective 4-way reversing valve, Defrost control failure on outdoor PCB, Outdoor fan not operating correctly

Safety first: Turn off power before touching the outdoor unit or coil.

Observe defrost: In heating mode, the unit should periodically enter defrost (fan stops, steam may appear). If this never happens, defrost control may be faulty.
Check coil sensor: Ensure the outdoor coil thermistor is attached correctly and replace if faulty.
Outdoor fan: Confirm the fan runs properly in heating mode. Replace if not.
Professional service: Reversing valve or PCB defrost logic issues require a technician to diagnose and repair.

Professional Required 5/5

Outdoor Coil Thermistor / 4-way Reversing Valve

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