Fujitsu ABHG18KRTA, Service Manual

Page: 266 / 471

2-34. E: 86. High pressure switch error (Outdoor unit)
Indicator Indoor unit
Operation indicator 8 time flash
Timer indicator 6 time flash
Economy indicator Continuous flash
Error code E: 86
Detective actuator
Outdoor unit main PCB
When pressure switch open is detected in 10 seconds
after the power is turned on.
High pressure switch
Forecast of cause
Connector connection failure
Pressure sensor failure
Main PCB failure
Check point 1. Reset power supply and operate
If no, go to "Check point 3" .
Does abnormal LED indication show again?
↓
Check point 2. Check output voltage of main
PCB
Make sure circuit diagram of outdoor unit and
check terminal voltage at thermistor (DC 5.0 V
± 5%).
NOTE: For details of thermistor connector, re-
fer to
"Wiring diagrams" in Chapter 2.
TECHNICAL DATA AND PARTS LIST
on page 02-117.
If the voltage is not correct, replace main PCB.
↓
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.
↓
End
• Characteristics of pressure switch
Pressure switch 1
Contact: Short → Open 4.2 ±0.1 MPa
Contact: Open → Short 3.2 ±0.15 MPa
CN37
Pressure switch 2
Contact: Short → Open 37
+0
-0.2
MPa
Contact: Open → Short 2.9 ±0.2 MPa
CN36
2-34. E: 86. High pressure switch error (Outdoor unit)
- (03-50) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING