Fujitsu ASU30RLE Service Instruction page 62

Trouble shooting 23
OUTDOOR UNIT Error Method:
Heat Sink Thermistor Error
Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Inverter PCB failure
If this error is displayed, replace Inverter PCB
Indicate or Display:
Indoor Unit :
Operation lamp: 7 times Flash,
Timer lamp : 7 times Flash
ERROR CODE : [E : 77]
Detective details:
Heat sink temperature thermistor (Built-in IPM) open/short detected
02-26
Outdoor unit :
Mode Error L1 L2 L 3 L 4
2 7 7
: Light OFF : Light ON n : n times blinking
L 5 L 6