Fujitsu AO*24LMAKL, Service Instruction

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Trouble shooting 13
INDOOR UNIT
OUTDOOR UNIT Error Method:
Indicate or Display:
Indoor Unit : No LED
Outdoor Unit : LED 9 times blink/ 8 times blink(AU*24LMAKL)
ERROR CODE : E : 16
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 3 :
Check Point 2 : Check voltage of Main PCB (DC5.0V)
HIGH PRESSURE SW
BLACK
BLACK
RED
RED
CN37
1
2
1
2
3
4WV
OK
Check Point 1 :
Reset Power Supply and operate
Check Point 3 : Check Pressure Switch
YES YES
NO NO
Pressure Switch Error
Outdoor Unit Main PCB Circuit
Pressure Switch
1. Connector connection failure 2. Pressure Switch failure 3. Main PCB failure
When pressure switch open is detected in 10 seconds
after the power is turned on.
Does abnormal LED indication show again?
Make sure circuit diagram of outdoor unit and check terminal voltage
at Pressure Switch. (DC5.0V)
If the voltage does not appear, replace Main PCB.
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.
07-16