Fujitsu AUXB04GALH Service Manual page 138

Trouble shooting 50
OUTDOOR UNIT Error Method:
High Pressure Switch 1 Error
Detective Actuators:
High pressure switch 1
Forecast of Cause :
1. High pressure switch 1 connector disconnection, open
2. High pressure switch 1 characteristics defective
3. Main PCB defective
Check Point 1 : Check the high pressure switch 1 connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check the high pressure switch 1 characteristics
Switch characteristics check
* For the characteristics of high pressure switch 1, refer to the "Service Parts Information 23".
OK
Check Point 3 : Replace Main PCB
Change Main PCB and set up the original address.
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:
E86. 4
Outdoor Unit : E. 8 6. 4
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code
Detective details:
When the power was turned on, "high pressure switch 1: open" was detected.
04-62
Filter LED Continuous Flash.
: 9 U / 8 6