Fujitsu AirStage AB12, Service Manual

Page: 105 / 199

ERROR CONTENTS ERROR CAUSE REMEDY
ERROR
CODE
Discharge
temperature 3
error 1. Check for leak and check additional
refrigerant amount and recharge
suitable refrigerant.
1. Gas leak or refrigerant level
low. 1. Generation condition.
Discharge temperature 3
remains 130 C or greater for
40 minutes and compressor
3 stopped 2 times or more.
2. Corresponding operation.
Error display to outdoor unit
LED and error output to
communication bus line.
3. Reset condition.
When all the following
conditions are satisfied:
1) Discharge temperature
protector 3 reset.
2) Discharge temperature
protector not operated for 40
minutes or longer. 23
2. Check outdoor fan motor operation.
Remove wind path obstruction. If fan
motor faulty, replace motor.
3. Check for loose or dislodged discharge
temperature sensor TH
D3
wiring and
check TH
D3
resistance. If abnormal,
replace sensor.
4. Check operation and coil resistance of
following electronic expansion valve. If
abnormal, replace electronic expansion
valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2 Coil resistance:
192 +/-19 ohms.
(2) Indoor units electronic expansion valve
EEV Coil resistance: 150 +/-50 ohms.
5. Check operation of following solenoid
valves. If operation faulty, replace
solenoid valve.
Cooling operation.
(1) Outdoor unit solenoid valve SV1.
(2) RB unit solenoid valves SV
S
Heating operation.
(3) Outdoor units solenoid valves SV1,
SV7, and SV8.
(4) RB unit solenoid valve SV
D
.
Heat recovery operation (1), (2), (3), (4).
2. Outdoor fan motor faulty.
3. Discharge temperature
sensor TH
D3
faulty.
4. Electronic expansion valve
operation faulty.
5. Solenoid valve operation
faulty.
– 105 –