Lennox LIUH018021T431E-1 Service Manual page 137

2.4.4.5. F0 Malfunction
Malfunction conditions
Possible causes
Electrical Control System
If the outdoor current exceeds the current limit value, the LED
displays a failure code.
● Wiring mistakes
Faulty bridge rectifier
●
● System blockages
●
Faulty outdoor PCB
Troubleshooting
135