F2
Hitachi
High Discharge Temperature / Compressor Overheat
Unit stops, F2 displayed, often during heating mode on 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
Blocked outdoor coil or fan, Low refrigerant charge causing high discharge temp, Overloaded compressor due to dirty filters and coils, Faulty discharge temperature sensor
How to Fix / Troubleshooting
Safety first: Turn OFF the unit and allow both indoor and outdoor units to cool before inspection.
Steps:
- Clean indoor filters and coil: Ensure indoor airflow is not restricted.
- Clean outdoor coil: Remove leaves, dust, and debris from the outdoor coil fins using a soft brush or low‑pressure water spray from inside out. Do not bend fins.
- Check outdoor fan: Confirm the outdoor fan runs at normal speed and is not obstructed.
- Ambient conditions: Extremely high outdoor temperatures or blocked hot air recirculation (unit too close to wall) can cause F2. Improve clearance and ventilation.
If F2 recurs: A technician should check refrigerant charge, discharge sensor, and compressor condition.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Condenser Coil and Discharge Temperature Sensor
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