Fujitsu AOG30KATA Series Service Instruction page 79

Trouble shooting 36
OUTDOOR UNIT Error Method:
Heat sink Temp. Error
Detective Actuators:
Outdoor unit Inverter PCB
Heat sink temperature thermistor
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. thermistor defective
Check Point 1 : Check the heat sink state
Heat sink foreign matter, soiling check
OK 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 OK
Check Point 3 : Check the heat sink temp. thermistor
Heat sink temp. thermistor characteristics check
(Check by disconnecting thermistor from PCB.
Refer to the Troubleshooting 26)
OK OK
Check Point 4 : Replace Inverter PCB
Replace Inverter PCB
Indicate or Display:
Error code : AC
Detective details:
"Protection stop by "heat sink temp.
generated 2 times within 24 hours.
02-37
Outdoor unit :
Mode Error L1 L2 L3 L4
2 10 12
: Light OFF : Light ON n : n times blinking
80°C""
L5 L6