81
E4
High Discharge Temperature Protection of
Compressor.
Status:
Cooling operation, compressor stops while
indoor fans runs. Heating operation, complete
unit stops
1. Faulty outdoor temperature sensor
2. Refrigerant leak
3. Poor airfl ow of outdoor unit
4. Follow Troubleshooting procedure
Error Code Diagnostics
E4 Error Code
Start Troubleshooting
Is outdoor temperature above 127
0
F
Normal protection, outdoor
ambient is higher than normal
parameters
Yes
Remove power, then restart after 20
minutes
Are indoor and outdoor coils clean
and free from obstructions?
Are indoor and outdoor fans
operating properly?
Replace AP1 control board
End Troubleshooting
Clean Coils
1. Check fan for obstruction
2. Check resistance of fan
leads and voltage to
motor
3. Check fan connections
Replace fan
Yes
Yes
No
No
Outdoor Fan Connection
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