Fujitsu AOU30RLXEH, Service Instruction

Page: 64 / 120

Trouble shooting 25
OUTDOOR UNIT Error Method:
Pressure Sensor Error
Outdoor unit main PCB
30 seconds or more after power-on, when pressure sensor detection value
detects the condition below continuosly for 30 seconds or more.
Ps < 37.71 psi (-0.26 Mpa) or Ps > 816.56 psi (5.63 Mpa)
=
Detective Actuators: Detective details:
Indicate of Display:
1. Connector connection failure 2. Pressure sensor failure 3. Main PCB failure
・ Check if the terminal connection is loose.
・ Check if connector is removed.
・
Check if cable is open.
・
Check if connector is erroneous connection.
Forecast of Cause:
Outdoor unit :
POWER
MODE
ERROR
2
8
(L1) (L2) (L6) (L5) (L4) (L3)
6
PUMP
DOWN
LOW
NOISE
PEAK
CUT
Test 2 : Check Voltage from Main PCB
Test 1 : Check the connection of the pressure sensor
DC
DC
With the connector connected to the PCB, measure the voltage between CN91:3-4
of the Main PCB.
Characteristics of pressure sensor
4.5
(5.0)
0.5
0
Output [DCV]
Pressure [psi (MPa)]
362.59 725.19
PRESSURE
SENSOR
PS
(2.5)
2.5
>>Upon correcting the removed connector or miss-wiring, reset the power.
OK
If the voltage is not on the connector, replace Main PCB.
If the voltage is incorrect value, replace the Pressure sensor.
1
2
3
4 1
2
RED
WHITE
BLACK
3
4
CN91
+
-
02-28
=
Indoor Unit :
Operation lamp: 8 times Flash,
Timer lamp : 6 times Flash
ERROR CODE : [E : 86]
n: n times blinking : Light ON : Light OFF