Fujitsu ASU30RLE Service Instruction page 64

Trouble shooting 25
OUTDOOR UNIT Error Method:
Pressure Sensor Error
Detective Actuators:
Outdoor unit main PCB
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
With the connector connected to the PCB, measure the voltage between CN91:3-4
of the Main PCB.
CN91
DC
1 1
2 2
3 3
+
-
4 4
If the voltage is not on the connector, replace Main PCB.
If the voltage is incorrect value, replace the Pressure sensor.
Indicate of Display:
Indoor Unit :
Operation lamp: 8 times Flash,
Timer lamp
ERROR CODE : [E : 86]
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 < 37.71 psi (-0.26 Mpa) or Ps > 816.56 psi (5.63 Mpa)
=
Characteristics of pressure sensor
RED
WHITE
PS
BLACK
PRESSURE
SENSOR
: 6 times Flash
=
4.5
2.5
0.5
0
362.59 725.19
(2.5) (5.0)
Pressure [psi (MPa)]
02-28
Outdoor unit :
PUMP LOW
POWER
DOWN NOISE
ERROR
MODE (L1) (L2) (L3) (L4)
8 6
2
: Light OFF : Light ON n : n times blinking
DC
PEAK
CUT
(L5) (L6)