Fujitsu Comfort Series Service Manual page 37

Troubleshooting 16-1
OUTDOOR UNIT Error Method:
Pressure sensor error
Detective Actuators:
High pressure switch
Forecast of Cause :
1. High pressure switch connector disconnection, open
2. High pressure switch characteristics failure
3. Inverter PCB failure
Check Point 1 : Check the high pressure switch connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check the high pressure switch characteristics
Switch characteristics check
* For the characteristics of high pressure switch, refer to below.
OK
Check Point 3 : Replace Inverter PCB
Change Inverter PCB, and execute the check operation again.
Type of contact
C
H
Pressure
Characteristics of pressure switch (P770)
Contact : Short Open
Contact : Open Short
Indicate or Display:
Hydraulic unit :
Green Red
8 6
n : n times blinking
Detective details:
When the power was turned on, "high pressure switch : open" was detected.
Pressure switch
4.2 0.1MPa
3.2 0.15MPa
03-18
Outdoor unit :
Mode Error L1 L2 L3 L4
2 8 6
: Light OFF : Light ON n : n times blinking
L5 L6