What does EC 50 mean?
Condenser fan motor is not operating or not reaching proper speed.
Common causes
- Failed condenser fan motor
- Debris blocking fan blade
- Wiring harness damage
- Control board failure
- Seized fan bearings
Diagnostic & testing steps
- 1. Remove lower grille to access condenser area
- 2. Inspect fan blade for obstructions or debris
- 3. Spin fan blade by hand to check for binding
- 4. Test fan motor with multimeter: 10-50 ohms
- 5. Apply 12VDC directly to motor to test operation
- 6. Check control board output at fan connector
Tools required
- Multimeter
- 12V power supply
- Phillips screwdriver
- Vacuum
OEM parts & part numbers
Condenser Fan Motor
Part numbers: 4200520, 4200521
Safety warning
⚠️ Unplug unit before accessing condenser compartment
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