Mitsubishi PWFY-P36NMU-E-BU Service Handbook page 55

1. Error Code
4230
Heat sink overheat protection
2. Error definition and error detection method
When the heatsink temperature (THHS) remains at or above 85˚C is detected.
3. Cause, check method and remedy
C a u s e
(1) Checking the fan wiring.
(2) Checking the control
board output voltage
(3) Checking the air passage
for blockage
(4) THHS fault
Refer to section - 5 - "Inverter" under part [3] "Trouble shooting principal parts" for error codes related to the
inverter.(page 69)
C
Check connectors CN506A and CN506B on the control board.
Check the fan wiring for breakage and damage.
Check the output voltage at CN506A and CN506B on the control
board during inverter operation.
Criteria : Output voltage
Replace the control board if no voltage is output during inverter
operation.
Replace the fan if voltage is output from the control board but the
fan does not operate.
Check the heatsink cooling air passage for blockage.
1) Check INV board IGBT for proper connection.
Check that heatsink on IGBT is installed properly.
2) Check the THHS wiring for damage.
Replace the THHS sensor if problems are found.
3) Check the THHS sensor value on the LED monitor.
Replace the THHS sensor if the values are abnormal.
- 52 -
h e k c m e h t o d a n d e r m e d y
22V