Heat Sink Temperature Abnormal - Fujitsu Airstage V-II Service Manual

Trouble shooting 60
OUTDOOR UNIT Error Method:
Heat Sink Tempreture Abnormal
Detective Actuators:
Heat sink 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 thermistor 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 : Check the heat sink thermistor
Heat sink thermistor characteristics check (Check by disconnecting
thermistor from PCB.)
* For the characteristics of the thermistor, refer to "Service Parts Information 22".
Indicate or Display:
Outdoor Unit : E. AC. 4
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
Error Code : AC
Detective details:
"Protection stop by "heat sink temperature
60 minutes
04-68
88°C"" generated 3 times within