Fujitsu Comfort Series Service Manual page 45

Troubleshooting 23
OUTDOOR UNIT Error Method:
Heatsink Temperature Error
Detective Actuators:
Outdoor unit Inverter PCB
Heatsink 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. Heatsink temp. thermistor defective
Check Point 1 : Check the heatsink state
Heatsink 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 heatsink temp. thermistor
Heatsink temp. thermistor characteristics check
(Check by disconnecting thermistor from PCB.
Refer to the Troubleshooting 13)
OK OK
Check Point 4 : Replace Inverter PCB
Replace Inverter PCB
Indicate or Display:
Hydraulic unit :
Green Red
10 12
n : n times blinking
Detective details:
"Protection stop by "heatsink temp.
generated 2 times within 24 hours.
03-26
Outdoor unit :
Mode Error L1 L2 L3 L4
2 10 12
: Light OFF : Light ON n : n times blinking
80°C""
L5 L6