F2
Heil
Outdoor Unit Lockout
Heil communicating thermostat shows F2 outdoor unit fault; indoor blower runs but no cooling
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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
Repeated high- or low-pressure trips, Locked rotor compressor, Severe refrigerant issue, Outdoor control board lockout
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor disconnect and indoor breaker before inspection.
- Step 1 – Reset lockout: Turn off power to the outdoor unit for 5–10 minutes, then restore. Many Heil boards will clear lockout after a power cycle.
- Step 2 – Observe startup: After reset, listen for compressor and fan operation. If the unit quickly shuts down again, a pressure or compressor fault is likely.
- Step 3 – Check airflow and coils: Ensure filters are clean and both indoor and outdoor coils are not blocked or iced.
- Step 4 – Professional service: Because F2 usually indicates a serious refrigeration or compressor problem, schedule a Heil-qualified technician to check pressures, compressor amperage, and safety switches.
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Repair Difficulty
Professional Required
5/5
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