Toshiba Reversing Valve or Mode Control Issue

The indoor unit blows warm air in cooling mode or cold air in heating mode intermittently.

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.

Possible Causes

Sticking four-way reversing valve, faulty reversing valve coil, incorrect control signal from the outdoor PCB, low refrigerant charge affecting mode change.

How to Fix / Troubleshooting

Safety first: Turn off power before accessing outdoor components. Work on the refrigerant circuit must be performed by licensed personnel.

Step 1 – Confirm mode setting: Ensure the remote control is set to the correct mode (Cool or Heat) and not Auto, especially if the 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 the power off, verify that the reversing valve coil wires are secure.
Step 4 – Technician diagnosis: If symptoms persist, a technician should test the coil voltage, valve operation, and refrigerant charge.

Repair Difficulty

Hard 4/5

Required Part

Four-Way Reversing Valve Coil

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