ERROR
ERROR CONTENTS
CAUSE
COUNTERMEASURE
00 No errors
02
1. Error occurrence condition
When power is turned on,
error occurs in model
information, which is
memorized in EEPROM.
2. Relevant operation
1) All compressors are
stopped (not started).
2) Error is displayed on LED of
outdoor unit and output to
communication bus line.
3. Clearance
Model information, which is
memorized in EEPROM
is recovered.
1. Error occurrence condition
Communication between
two microcomputers on
outdoor unit control printed
circuit board is not
performed normally.
2. Relevant operation
1) All compressors is stopped
(not started).
2) Error is displayed on LED of
outdoor unit and output to
communication bus line.
3. Clearance
Communication between
microcomputers is
recovered.
Replace outdoor unit control printed
circuit board.
1. When power is turned OFF and turned
ON again:
1) If error doesn't occur, printed circuit
board is normal. Then, remove noise
sources near outdoor unit.
2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2.
2. Replace outdoor unit control printed
circuit board.
Model information is not
memorized, or erased because
of some reason.
1. Effect of extraneous noise
2. Outdoor unit control printed
circuit board is faulty.
Model
information
error
03
Circuit board
error
1. Error occurrence condition
Outdoor unit control printed
circuit board detects
frequency outside of rating.
2. Relevant operation
1) All compressors are
stopped (not started).
2) Error is displayed on LED of
outdoor unit and output to
communication bus line.
3. Clearance
Outdoor unit control printed
circuit board detects the
specified frequency.
Check power supply frequency and
apply the power whose frequency is
within the specified frequency.
04
Power supply
frequency
abnormal
1. Check power supply wiring.
2. Check power supply wiring. If there
are no mistakes, replace outdoor unit
control printed circuit board.
1. Reverse phase wiring.
2. Reverse phase prevention
circuit is faulty.
05
Reverse phase
blocker error
Power supply frequency is in
the following range. Lower than
45Hz or higher than 65Hz.
1. Error occurrence condition
Reverse phase prevention
circuit detects the wrong
phase of power supply or
the correct power supply
input is not detected.
2. Relevant operation
1) All compressors are
stopped.
2) Error is displayed on LED of
outdoor unit and output to
communication bus line.
3. Clearance
Reverse phase prevention
circuit doesn't detect
reverse phase input.
OUTDOOR UNIT TROUBLESHOOTING
ERROR
CODE
05-15
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