Tosot
Reversing Valve Stuck or Control Fault
Unit blows cold air in heating mode (heat pump models)
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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
Failed reversing valve coil, Stuck reversing valve slide, Incorrect mode signal from indoor PCB, Low refrigerant charge
How to Fix / Troubleshooting
Safety first: Turn off power before accessing the outdoor unit.
- Confirm mode: Ensure the remote is set to HEAT and the set temperature is above room temperature.
- Check reversing valve coil: Locate the coil on the 4-way valve and ensure it is connected. A technician can test coil resistance; replace if open.
- Tap valve body: With power off, gently tap the valve body with a rubber mallet to attempt to free a stuck slide (do not use excessive force).
- If still no heat: Professional diagnosis of refrigerant charge and valve operation is required. The valve may need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
4-Way Reversing Valve Coil
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