What does E228 mean?
High side refrigerant pressure exceeded safe operating limit.
Common causes
- Dirty condenser coil
- Condenser fan motor failure
- Refrigerant overcharge
- Non-condensable gases in system
Diagnostic & testing steps
- 1. Check discharge pressure: normal 375-400 PSI R-410A at 95°F
- 2. Clean condenser coil with coil cleaner and rinse
- 3. Verify condenser fan is running and correct direction
- 4. Test condenser fan capacitor
- 5. Check subcooling: overcharged if >15°F
Tools required
- Manifold gauges
- Capacitor tester
- Coil cleaner
OEM parts & part numbers
Condenser Fan Motor, Fan Capacitor
Part numbers: 25M48, 89W59
Safety warning
⚠️ Do not open any refrigerant circuit fittings while system is under high pressure.
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