F1
Day & Night
High Discharge Temperature / Compressor Overheat
F1 code, unit may run at reduced capacity or shut down intermittently
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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
Dirty outdoor coil reducing heat rejection, Low indoor airflow (dirty filter, blocked coil), Undercharged or overcharged refrigerant, Failing compressor with high internal friction, Faulty discharge temperature sensor
How to Fix / Troubleshooting
Safety first: Turn OFF power at both indoor and outdoor disconnects before cleaning or inspection.
- Step 1 – Clean coils: Clean both indoor evaporator and outdoor condenser coils as per manufacturer guidelines. Dirty coils are a common cause of high discharge temperature.
- Step 2 – Verify airflow: Replace filters, open all registers, and ensure blower wheel is clean.
- Step 3 – Inspect discharge sensor: At the outdoor unit, locate the discharge line temperature sensor near the compressor outlet. Check that it is firmly attached and wiring is intact.
- Step 4 – Allow cool-down: After an overheat trip, allow the unit to sit powered OFF for at least 30 minutes before restarting.
- Professional diagnostics: If F1 recurs, a technician must check refrigerant charge, compressor amp draw, and discharge temperature to prevent compressor failure.
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Repair Difficulty
Hard
4/5
Required Part
Discharge Line Temperature Sensor
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