MHI · R410A Systems
This error indicates that the thermistor located under the compressor dome in the outdoor unit is disconnected, preventing accurate temperature monitoring.
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Turn off the main power supply to the outdoor unit at the circuit breaker.
Contact a qualified HVAC technician to inspect the compressor under dome thermistor and its connections.
The technician will ensure the wiring is secure and the thermistor is properly seated.
If the thermistor is faulty, it will require professional replacement.