Fujitsu AUXB04GALH Service Manual page 156

Trouble shooting 68
OUTDOOR UNIT Error Method:
Outdoor unit Heat Sink Tempreture
Abnormal
Detective Actuators:
Heat sink temp. sensor
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 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 temp. sensor
Heat sink temp. sensor characteristics check
(Check by disconnecting sensor from PCB.)
* For the characteristics of the thermistor, refer to "Service Parts Information 24".
Caution
By changing of DIP SW 4-2 to ON, the Back-up operation can start when the active outdoor unit exists on the multi outdoor unit connection.
(Stand alone outdoor unit is impossible)
The following conditions will be concerned in use of back-up operation. (Please do not use the system with back-up operation for long time.)
- The operating compressor life time becomes shorter.
- The operating performance may drop due to the limited active compressor(s).
- The compressor may stop frequently by protection controlling.
*In order to keep the operating capacity, the release of the Low noise mode setting might be necessary.
Indicate or Display:
EAC. 4
Outdoor Unit : E. A C. 4
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / A C
Detective details:
"Protection stop by
"heat sink temp.
04-80
Filter LED Continuous Flash.
91°C (195.8°F) " occurred 3 times within 60 minutes.