Panasonic · air conditioners Error codes
The temperature sensor on the power module heatsink is short-circuited. This prevents the system from monitoring the temperature of critical power components.
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Inspect the heatsink temperature sensor and its wiring.
Check for any signs of overheating on the power module.
Ensure proper ventilation around the power module.
Turn off the unit, unplug it, wait 30 seconds, and plug it back in to reset.