Fujitsu
Reversing Valve or Mode Control Malfunction
Unit blows cold air in heating mode or hot air in cooling mode intermittently
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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
Sticking four-way reversing valve, Faulty reversing valve coil, Incorrect mode command from PCB, Low refrigerant affecting valve operation
How to Fix / Troubleshooting
Safety first: Turn off power before touching the outdoor unit. The reversing valve is part of the sealed refrigerant system.
- Confirm mode: Verify that the remote is set to the correct mode (Heat or Cool) and that the display matches the desired operation.
- Observe operation: When switching modes, allow several minutes for the system to stabilize. Some brief temperature swings are normal.
- Technician checks:
- Test the four-way valve coil for correct resistance and voltage.
- Check refrigerant charge and pressures.
- Replace the reversing valve or coil if confirmed faulty.
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Repair Difficulty
Professional Required
5/5
Required Part
Four-Way Reversing Valve
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