Fujitsu AB*G14LVTA Service Instructions Manual page 64

Trouble shooting 24
OUTDOOR UNIT Error Method:
INDOOR UNIT
High pressure switch error
Detective Actuators:
Outdoor unit Main PCB
Pressure switch
Forecast of Cause :
1. Connector connection failure
Check Point 1 : Reset power supply and operate
Does abnormal LED indication show again?
YES YES
Check Point 3 : Check Point 2 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage
at Pressure switch. (DC5.0V)
RED
1
CN37
RED
2
WHITE
1
CN36 WHITE
2
If the voltage does not appear, replace Main PCB.
OK
Check Point 3 : Check Pressure switch
Check if connector is loose or cable is open.
>> If no abnormal connection is found,
replace Pressure Switch.
After replacing Pressure switch, check operating
condition and pressure in operation.
Characteristics of pressure switch
PRESSURE SWITCH 1 (CN37)
Contact : Short Open
Contact : Open Short
Indicate or Display:
Refer to error code table.
Detective details:
When the pressure switch open is detected in 10 seconds
after the power is turned on.
2. Pressure switch failure
PRESSURE SWITCH 1
PRESSURE SWITCH 2
Pressure switch 1
4.2 0.1MPa
3.2 0.15MPa
3. Main PCB failure
NO NO
PRESSURE SWITCH 2 (CN36)
Contact : Short Open
Contact : Open Short
02-27
Pressure switch 2
+0
3.7 MPa
- 0.2
2.9 0.2MPa