88
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 airow of outdoor unit
4. Follow Troubleshooting procedure
Error Code Diagnostics
E4 Error Code
High Discharge Temperature Protection of Compressor.
Start Troubleshooting
Has the compressor discharge
temperature reached 239
0
F
Yes
Check the system for refrigerant leaks, Repair,
evacuate and charge per instructions in
“Charging” section
Is resistance of temperature
sensor correct?
Replace sensor
No No
Replace the outdoor
unit circuit board
Yes
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