Fujitsu ABYG36KRTA Service Manual page 71

2-26. E: 86. High pressure switch error (Outdoor unit)
Wired remote
Indicator
controller
Outdoor unit main PCB
Detective actuator
High pressure switch
Forecast of cause
Check point 1. Check connection of the pressure sensor
• Check if the terminal connection is loose.
• Check if connector is removed.
• Check erroneous connection.
• Check if cable is open.
-> Upon correcting the removed connector or mis-wiring, reset the power.
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, refer to
TECHNICAL DATA AND PARTS LIST on page 02-17.
If the voltage is not correct, replace main PCB.
Check point 3. Check output voltage of pressure sensor
Make sure circuit diagram of outdoor unit and check terminal voltage. Voltage is refer
to the following graph.
If the voltage is not correct, replace pressure sensor.
2-26. E: 86. High pressure switch error (Outdoor unit)
Error code
↓
↓
4.5
Voltage [V]
0.5
0
Pressure [MPa]
↓
End
30 seconds or more after power-on, when pressure
sensor detection value detects the condition below
continuously for 30 seconds or more.
Ps ≤ 0 or Ps ≥ 5 [MPa]
Connector connection failure
Pressure sensor failure
Main PCB failure
"Wiring diagrams"
5
- (03-31) -
E: 86
in Chapter 2.
2. Troubleshooting with error code