Fujitsu AU G18LVLB Series Service Instruction page 75

Trouble shooting 31
OUTDOOR UNIT Error Method:
Pressure Switch Error
Detective Actuators:
High pressure switch
Main PCB
Forecast of Cause :
1. High pressure switch connector disconnection, open
2. High pressure switch characteristics failure
3. Main PCB failure
Check Point 1 : Check the high pressure switch connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check the high pressure switch characteristics
Switch characteristics check
* For the characteristics of high pressure switch, refer to below.
OK
Check Point 3 : Replace Main PCB
, and execute the check operation again.
Change Main PCB
Type of contact
C
H
Pressure
Characteristics of pressure switch
Contact : Short Open
Contact : Open Short
Indicate or Display:
Indoor Unit : Operation lamp: 8 time Flash,
Timer lamp: 6 time Flash
Economy lamp : Continuous flash.
ERROR CODE : [E : 86]
Detective details:
When the power was turned on, "high pressure switch : open" was failure.
(CN120)
Pressure switch
4.2 0.15MPa
3.2 0.15MPa
02-36
Outdoor unit :
PUMP LOW
POWER
DOWN NOISE
ERROR
MODE (L1) (L2) (L3) (L4)
6
2 8
PEAK
CUT
(L5) (L6)