Panasonic · air conditioners Error codes
The 4-way valve, which directs refrigerant flow for heating or cooling, is not operating correctly. This can be due to mechanical issues or valve coil problems.
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Inspect the 4-way valve for any visible damage.
Check the electrical connections to the valve coil.
Ensure the valve is not obstructed.
Turn off the unit, unplug it, wait 30 seconds, and plug it back in to reset.