Friedrich Floating Air Pro-Premiere FPHW091 Service & Parts Manual page 64

Diagnostic Codes
Error Power Timer
Code
1 2
41 OFF OFF
The failure is detected when the room temperature sensor broken or shorted over 5 sec.
The failure is detected when the temperature sensor of heater exchange broken or shorted over 5 sec.
The failure is detected when each setting data is not match after the EEPPOM self‑check two times.
The failure is occur when the grounding signal is not detected after the appliance power ON.
64
TROUBLESHOOTING
Running
3 Content
ON The failure for Indoor
grounding protective
The root cause is may be one of the following
The indoor control board failed.