Heat Sink Temp Sensor Error - Fujitsu Airstage J-II Service Manual

Trouble shooting 26
OUTDOOR UNIT Error Method:

Heat Sink Temp Sensor Error

Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Inverter PCB failure
Indicate or Display:
Outdoor Unit : E. 77. 1
Indoor Unit
Error Code
Detective details:
Heat sink temperature thermistor ( Inside IPM ) open/short circuit detected
If this error is displayed, replace Inverter PCB
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: 77
04-36