Toshiba
Reversing Valve or Mode Control Issue
Indoor unit blows warm air in cooling mode or cold air in heating 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 control signal from outdoor PCB, Low refrigerant charge affecting mode change
How to Fix / Troubleshooting
Safety first: Turn off power before accessing outdoor components. Refrigerant circuit work must be done by licensed personnel.
- Step 1 – Confirm mode setting: Ensure the remote is set to the correct mode (Cool or Heat) and not Auto if behavior is confusing.
- Step 2 – Listen for valve shift: When changing modes, listen at the outdoor unit for a click from the reversing valve coil.
- Step 3 – Check coil wiring: With power off, verify the reversing valve coil wires are secure.
- Step 4 – Technician diagnosis: If symptoms persist, a technician should test coil voltage, valve operation, and refrigerant charge.
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Repair Difficulty
Hard
4/5
Required Part
Four-Way Reversing Valve Coil
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