Fujitsu AMUG24LMAS Service Manual page 79

Troubleshooting 23-2
Outdoor unit discharge pressure sensor error
(AOUG36/48LMAS1)
Detective actuators:
Outdoor unit main PCB
Detective details:
30 seconds or more after power-on,
when pressure sensor detection value
detects the condition below continuosly
for 30 seconds or more.
Ps ≤ 43.51 psi (0.30 Mpa)
or Ps ≥ 725.19 psi (5.00 Mpa)
Forecast of cause:
1. Connector connection failure
2. Pressure sensor failure
3. Main PCB failure
Test 1 : Check the connection of the pressure sensor
・Check if the terminal connection is loose.
・Check if connector is removed.
・Check if connector is erroneous connection.
・Check if cable is open.
>> Upon correcting the removed connector or miss-wiring, reset the power.
OK
Test 2 : Check voltage from main PCB (Parts information 8)
With the connector connected to the PCB,
measure the voltage between CN92:2-3
of the main PCB.
DC
+
-
If the voltage is not on the connector, replace Main PCB.
If the voltage is incorrect value, replace the Pressure sensor.
CN92
RED
1 1
WHITE
2 2
PS
BLACK
3 3
PRESSURE
SENSOR
Indicate or Display:
Indoor unit
Operation lamp: 8 times Flash,
Timer lamp
Wired remote control
Error code : [E : 86]
Outdoor unit (AOUG36/48LMAS1)
Mode Error
2
: Light OFF
Characteristics of pressure sensor
4.5
2.5
0.5
0
Pressure [psi (MPa)]
03-31
: 6 times Flash
A B C D
8 6
: Light ON n : n times blinking
DC
362.59 725.19
(2.5) (5.0)
E F