Fujitsu ASU7RLF1 Service Instructions Manual page 60

Trouble shooting 23
OUTDOOR UNIT Error Method:
High 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
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)
CN37 RED
1
RED
2
RED
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 (CN37)
Contact : Short Open
Contact : Open Short
Indicate or Display:
Outdoor Unit :
Indoor Unit
ERROR CODE : [E : 86]
Detective details:
When pressure switch open is detected in 10 seconds
after the power is turned on.
PRESSURE SWITCH
Pressure switch
608.7 14.5 PSI
463.8 21.7 PSI
LED 1 : 9 time Flash
: Operation lamp: 8 time Flash, Timer lamp: 6 time Flash
Economy lamp: Continuous flash.
NO
02-28