Fujitsu AirStage AB12, Service Manual

Page: 106 / 199

ERROR CONTENTS ERROR CAUSE REMEDY
ERROR
CODE
High-pressure
error
1. Open ball valve fully. 1. Ball valve not open
completely. 1. Generation condition.
When any of following
conditions satisfied:
1) High-pressure protection
stops compressor 2 times or
more in 40 minutes.
2) High-pressure SW operated
after restarted 3 minutes
after compressor stopped by
high-pressure protection.
2. Corresponding operation.
Error display to outdoor unit
LED and error output to
communication bus line.
3. Reset condition.
When all of following
conditions satisfied:
1) High pressure SW reset after
restarting 3 minutes after
compressor stopped by
high-pressure protection.
2) High pressure protection not
operated for 40 minutes or
longer.
* High pressure SW set value
3MPa OFF , 2.4MPa ON 24
2. Check required installation dimensions.
3. Clean heat exchanger or remove
foreign matter.
4. Check outdoor fan motor operation.
Remove wind path obstruction. If fan
motor faulty, replace motor.
5. Check pressure using pressure gauge.
If pressure SW faulty, replace SW.
2. Outdoor unit short cycle.
3. Outdoor heat exchanger dirty
or clogged with foreign matter.
4. Outdoor fan motor faulty.
5. Pressure SW faulty.
6. Remove obstruction.
7. Clean filter.
8. Check indoor fan motor operation. If
fan motor faulty, replace motor.
9. Check operation and coil resistance of
following electronic expansion valve. If
faulty, 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 +/-15 ohms.
10. Check operation of following solenoid
valves.If operation faulty, replace
solenoid valve.
Cooling operation
(1) Outdoor unit solenoid valve SV
S
(2) RB unit solenoid valve SV
S
Heating operation
(3) Outdoor units solenoid valves SV2,
SV7, and SV8
(4) RB unit solenoid valve SV
D
Heat recovery operation (1), (2), (3),
(4)
11. Remove indoor and outdoor
installation conditions and other
overload causes.
6. Indoor unit short cycle.
7. Filter clogged.
8. Indoor fan motor faulty.
9. Electronic expansion valve
operation faulty.
10. Solenoid valve operation
faulty.
11. Overload
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