Outdoor Unit Heat Exchanger Sensor (ThOR) Defective / Cooling High Pressure
Mitsubishi Electric · FR-D700 Inverter
What does E35 mean?
The outdoor unit heat exchanger sensor (ThOR) is defective, indicated by an open or closed circuit resistance, or by a poor connection of the sensor connector on the outdoor unit PCB. This can also be caused by high pressure in the cooling system, impacting heat exchange.
Common Causes
- Outdoor unit heat exchanger temperature sensor (ThOR, e.g., P17) is faulty or shorted.
- High discharge pressure detected.
- Poor airflow over the outdoor unit heat exchanger.
- Overcharged refrigerant system.
- Faulty fan motor in the outdoor unit.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Measure the resistance of the outdoor unit heat exchanger sensor (ThOR) and compare it to the specified temperature-resistance chart.
- 2
Inspect the ThOR sensor connector on the outdoor unit PCB for secure and clean connection.
- 3
Measure the cooling system high pressure using a manifold gauge set, ensuring it is within operational limits.
- 4
Verify refrigerant charge and inspect condenser coils for cleanliness and obstructions impacting airflow.