Fujitsu AOY90 User Manual

ERROR
CONTENTS
ERROR CAUSE
REMEDY
ERROR
CODE
Discharge
pressure sensor
error
Replace discharge pressure sensor PH.
Discharge pressure sensor PH
faulty.
1. Generation condition.
1) Voltage output from output
remains under 0.8V for 3
minutes or longer. However,
not detected for 3 minutes
after power to outdoor unit
turned on.
2) Output sensor detection
value is 3.46MPa or greater.
2. Corresponding operation.
1) All compressors stop.
* Discharge pressure and
liquid line pressure
sensor error only.
2) Error display to outdoor unit
LED and error output to
communication bus line.
* For suction pressure
sensor error, only error
display to outdoor unit LED.
3. Reset condition.
Output voltage from pressure
sensor returns to 1- 5V.
19
2. Check outdoor unit control PC board
voltage output.
1) Oscilloscope.
(1) Check if 5+/-0.05V voltage output is
present between pins 1 and 2 of
CN52 and CN53.
(2) Check if 12V +/-10% voltage output is
present between pins 3 and 4 of
CN52 and CN53.
2) Tester.
Check if output voltage is present
between pins 3 and 4 of CN52 and
CN53. (1 time in 10 secs.Needle
deflects.)
* Voltage output 1 time in 10 seconds
250msec
3. Check output voltage 1.0 +/-0.1V
between connectors 3 and 4 of OIL LV
SEN-H (connected to CN52) and OIL
LV SEN-L (connected to CN53) in
tester diode mode. If output voltage is
abnormal, replace oil sensor.
* Connect tester plus terminal to 3 and
minus terminal to 4.
2. Output unit control PC power
supply voltage output
abnormal.
3. Oil sensor LED faulty.
Liquid line
pressure sensor
error
Replace liquid line pressure sensor PM.
Liquid line pressure sensor PM
faulty.
1A
Suction
pressure sensor
error
Replace suction pressure sensor PM.
Suction pressure sensor PM
faulty.
1B
Oil sensor error
1. Check contact of outdoor unit control
board connectors CN52 and CN53.
1. Connector contact faulty.
1. Generation condition.
At the same time "Oil below
oil sensor L level" and "Oil
over oil sensor H level"
states output by oil sensor.
2. Corresponding operation.
Error display to outdoor unit
LED.
3. Reset condition.
"Oil below oil sensor L level"
and "Oil over oil sensor H
level" states no longer output
by oil sensor.
1C
– 101 –

Fujitsu AOY90 Specifications

General

Brand	Fujitsu
Model	AOY90
Category	Air Conditioner
Language	English