Pressure Sw Error - Fujitsu AB A30LBT Series Service Instruction

Trouble shooting 14
OUTDOOR UNIT Error Method:
Pressure Switch Error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Pressure Switch
Forecast of Cause:
1. Connector connection failure
Check Point 1 : Reset Power Supply and operate
Does abnormal LED indication show again?
YES
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)
HIGH PRESSURE SW
RED
2 2
CN90
RED
1 1
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.
OK
Check Point 4 : Check High Pressure Protection on cooling
Check Excessive high pressure protection on cooling.
(Refer to Trouble shooting 21)
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.
2. Pressure Switch failure
NO
DC
02-18
3. Main PCB failure