TGM MWVIT09SA - Page 54

54
9.2.9 Over voltage or too low voltage protection diagnosis and solution(P1)
Error Code
P1
Malfunction decision
conditions
An abnormal voltage rise or drop is detected by checking the
specified voltage detection circuit.
Supposed causes ● Power supply problems.
● System leakage or block
●
PCB faulty
Trouble shooting:
Check the power supply
Check the connections and
wires
Stop the unit
No
Yes
No
Correct the connections or
replace the wires.
Yes
Replace the reactor
No
No
Replace the IPM board
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?
Check the reactor.Is it
normal?
Yes
Yes
Replace outdoor main PCB