Fisher FSAI-SU-92AE2 Service Manual page 47

8.2.8 Over voltage or too low voltage protection diagnosis and solution (P1)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check the power supply
Yes
Check the connections and
wires
Yes
Power on and when the unit is in standby,
check if the voltage between P and N is
around DC 310V or 340V or 380V? Then
start up the unit, measure the voltage
between P and N. Is it in 220V~400V?
Yes
Check the reactor
Yes
Replace the reactor
P1
An abnormal voltage rise or drop is detected by checking the
specified voltage detection circuit.
Power supply problems.
●
System leakage or block
●
PCB faulty
●
No
No
No
No
Stop the unit
Correct the connections or
replace the wires.
Replace the IPM board
Replace outdoor main PCB
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