Fujitsu AUXB04GALH Service Manual page 144

Trouble shooting 66
OUTDOOR UNIT Error Method:
Outdoor unit Heat Sink Tempreture
Abnormal
Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Foreign matter on heat sink, heat sink dirty
2. Foreign matter on heat exchanger, excessive ambient temperature rise
3. Heat sink temp. sensor (Inside IPM) defective
Check Point 1 : Check the heat sink state
Heat sink foreign matter, soiling check
OK
Check Point 2 :
Check the foreign matter and ambient temperature of heat exchanger
Heat exchange foreign matter check
Ambient temperature not raised by effect of other heat sources?
Discharged air not sucked in?
OK
Check Point 3 : Replace Inverter PCB
Replace Inverter PCB
E. AC. 4
Indicate or Display:
Outdoor Unit : E. AC. 4
Indoor Unit
Error Code
Detective details:
"Protection stop by
"heat sink temp.
04-74
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: AC
105°C generated 3 times within 60 minutes.