Outdoor Unit Troubleshooting - Fujitsu AB12 Service Manual

OUTDOOR UNIT TROUBLESHOOTING

ERROR
ERROR
CODE
00 No errors
1. Generation condition.
02
Model
data error
2. Corresponding operation.
1) All compressors stopped
2) Error display to outdoor unit
3. Reset condition.
Communication 1. Generation condition.
03
error
1) All compressors stopped
2) Error display to outdoor unit
3. Reset condition.
04 Power frequency
1. Generation condition.
faulty
2. Corresponding operation.
1) All compressors stopped
2) Error display to outdoor unit
3. Reset condition.
Reverse phase 1. Generation condition.
05
blocker error
2. Corresponding operation.
1) All compressors stopped.
2) Error display to outdoor unit
3. Reset condition.
CONTENTS
When power turned on, there
was an error in model
information memorized in
EEPROM.
(not started).
LED and error output to
communication bus line.
Model information
memorized in EEPROM
restored to normal.
Communication between two
microcomputers on outdoor
unit control PC board not
performed normally.
(not started).
LED and error output to
communication bus line.
Normal microcomputers
communication restored.
Outdoor unit control PC
board detected frequency
outside of rating.
(not started).
LED and error output to
communication bus line.
Outdoor unit control PC board
detects rated frequency.
Reverse phase prevention
circuit detected reverse
phase input or when the
normal input was not detected.
LED and error output to
communication bus line.
Reverse phase prevention
circuit no longer detects
reverse phase input.
ERROR CAUSE
Model information not
memorized, or erased for some
reason.
1. Effect of extraneous noise.
2. Outdoor unit control PC board
faulty.
Power line frequency below
45Hz or above 65Hz.
1. Reverse phase wiring.
2. Reverse phase prevention
circuit faulty.
– 96 –
REMEDY
Replace outdoor unit control PC board.
1. When power turned off, then turned
back on:
1) If error not generated again, PC board
is normal. Therefore, remove noise
sources near outdoor unit.
2) If error generated again, perform
following, in addition to removing noise
sources.
2. Replace outdoor unit control PC board.
Check power line frequency and supply
correct frequency.
1. Check power supply wiring.
2. Check power supply wiring. If there are
no mistakes, replace outdoor unit
control PC board.