Fujitsu AB 14LBAJ Series Service Instruction page 62

Trouble shooting 13
OUTDOOR UNIT Error Method:
INDOOR UNIT
Pressure Switch Error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Pressure Switch
Forecast of Cause :
1. Connector connection failure 2. Pressure Switch failure 3. Main PCB 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)
PRESSURE SWITCH 1
RED
1
CN37
RED
2
PRESSURE SWITCH 2
(For AO*30LMAW4)
RED
1
CN36
RED
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.
Indicate or Display:
Refer to error code table.
Detective details:
When pressure switch open is detected in 10 seconds
after the power is turned on.
NO NO
02-23