5-22
5
4. Mini VRF System Alarm Codes
Mini VRF SYSTEM
Trouble Diagnosis
1-1
1-4 : Single-phase model
1-2 : 3-phase model
3-1 : Single-phase model
2-1 : 3-phase model
Check for open circuit and the voltage at the breaker.
If a problem is found, fix it and check again.
Yes
No
Turn the power back on and check again.
Is the alarm triggered again?
1-4
2-1
Power wiring N-phase is connected.
Power wiring L2 and N are reverse connected. (3-phase only)
The connector CN-RY on the outdoor CR PC board is
connected properly (locked). (3-phase only)
1-2
1-3
4-1
Yes
No
Correct wiring.
1-3
Yes
No
Correct wiring.
1-4
Yes
No
1 Check
the power
supply &
the wiring
Are the wires (RE1, RE2) from the reactor firmly installed?
3-1
3-2
Correct wiring.
Yes
No
Turn the power back on and check again.
Is the alarm triggered again?
3-2
Replace the outdoor
unit HIC PC board.
4-1
Yes
No
3 Check the
outdoor
unit HIC
PC board
2 Check the
outdoor
unit CR
PC board
There may be a instantaneous blackout failure.
If there is nothing abnormal, see what happens.
4-1
4 Final check
P05 AC Power Supply Trouble
Error Detection Method
Error Diagnosis
Instantaneous blackout
Note : The work involved in diagnosing each of the items is extremely dangerous, so turn the power off at the breaker before
performing the tests.
Zero-cross (waveform input of power supply) error
DC voltage charge failure
1.
2.
Is the voltage on each of the
terminal boards 10%
of the rated voltage?
Correct wiring.
(connector)
3-1
Yes
No
P
U
V
W
NU
RE1
RE2
(3-phase outdoor unit HIC PC board)
ACXA73-04760 : (U-160PE2R8A, U-180PE2R8A, U-200PE2R8A, U-224PE2R8A)
■
Outdoor Unit Control HIC PCB
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