Fujitsu ASU18RLF Service Instructions Manual page 72

Trouble shooting 27
OUTDOOR UNIT Error Method:
Discharge Pressure Sensor Error
Detective Actuators:
Discharge pressure sensor
Forecast of Cause:
1. Discharge pressure sensor connector disconnection, open
3. Main PCB failure
Test 1 : Check the discharge pressure sensor connection state
Connector connection state check
Cable open check
OK
Test 2 : Check the discharge pressure sensor
Sensor characteristics check
*For the characteristics of the discharge pressure sensor,
refer to the (SERVICE PARTS INFORMATION 6).
OK
Test 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN92:1-2) voltage value = 5V
Remove the
PRESSURE SENSOR
PRESSURE SENSOR
RED
1 1
WHITE
2 2
CN92
BLACK
3 3
Discharge pressure sensor (CN92:1-2)
If the voltage does not appear, replace Main PCB,
and execute the check operation again.
Indicate of Display:
Indoor Unit
Operation lamp : 8 time Flash
Timer lamp
ERROR CODE : [E : 86]
Detective details:
・ When any of the following conditions is satisfied, a discharge pressure
sensor error is generated.
30 seconds or more have elapsed since the outdoor unit power was
turned on and pressure sensor detected value < 0.3V continued
for 30 seconds or more
30 seconds or more have elapsed since the outdoor unit power was
turned on and pressure sensor detected value > 5.0V was detected.
from Main PCB, check the voltage.
PS
02-32
Outdoor Unit
A
: 6 time Flash
8
: Light ON
. 2 i D c s h a g r e p
DC
Monitor
B C D E F
6
: Light OFF n : n time blinking
=
e r s s u e r s e n s r o a f u l i e r