10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
242
Alarm code
05
Code abnormal operation of picking up phase signal
- This alarm is displayed when the main power source phase is reversely connected or one phase is not
connected.
Correctly connect each
phase of the power source
Yes
Reverse phase connection
(Only 3 phases unit)
No
Yes
No
Correctly connect each
phase of the power source
Faulty PCB1 or other cause
(see below)
PCB1 is normal
PCB1 is normal
Single phase and 3
phases
(Is there any phase which
is not connected)?
Voltage for unit
to be suspended
Running voltage:
207 to 253V
Setting voltage:
Less than 187V
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Activation of reverse phase
sensor in the outdoor unit
Reverse or single phase
Check it according to the
electrical wiring
Replacing wires, repair,
tightening screws or correct
wiring
Faulty outdoor unit PCB - Replace PCB if faulty
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