Fujitsu AUUH18LUAS Service Manual page 100

2-28. E: 86.X. High pressure switch error (Outdoor unit)
(24/30/36 model)
→ired remote
Indicator
controller
Outdoor unit main PCB
Detective actuator
High pressure switch
Forecast of cause
Check point 1. Check the high pressure switch connection state
• Check connector and wiring connection state.
• Check if cable is open
-> Reset power when reinstalling due to removed connector or incorrect wiring.
Check point 2. Check the high pressure switch characteristics
• Check switch characteristics.
For the characteristics of the high pressure switch, refer to below.
Check point 3. Replace main PCB
Change main PCB and check operation again.
• Type of contact
• Characteristics of pressure switch
Contact: Short
Contact: Open
P770
2-28. E: 86.↓. High pressure switch error (Outdoor unit) (24/30/36 model)
Error code
→hen pressure switch open is detected in 10 seconds
after the power is turned on.
High pressure switch connector disconnection or open
End
C
Pressure
Pressure switch 1
Open
Short
- (03-34) -
E: 86
High pressure switch characteristics failure
Main PCB failure
H
4.2—4.05 MPa
3.2±0.15 MPa
2. Troubleshooting with error code