Johnson Controls HVWHP072B32S - Page 74

3-54
SM-18006
TROUBLESHOOTING
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 TheRUNindicator(red)ashes.
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The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code
1
,
the model name
1
and the number of connected indoor units are displayed on the LCD. The water source
unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Note 1: Except for some models.
This alarm code is displayed when one phase of main power supply is not connected.
Correctly connect each phase
of power supply.
Power supply wiring (L1, L2, L3)
is not connected correctly.
(Is there any phase not connected?)
No
Yes
W.S. PCB is normal.
W.S. PCB is normal.
Voltage for unit to
be suspended.
Running Voltage:
"B" V
Starting Voltage:
Less than "A" V
Abnormality with Power Supply.
Is there any excessively voltage
decrease at power supply?
Yes
Faulty W.S. PCB.
No
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Activation of
Open Phase
Sensor in Water
Source Unit
Check it according
to electrical wiring
in Section 3.1.1.
Replace wires, repair
and tighten screws
or correct wiring.
Reverse or Open Phase
Replace W.S. PCB
if faulty.
Faulty W.S. PCB
Check Item
Power Supply “A” “B”
208/230V,60Hz 177 188 to 253
460V,60Hz 391 414 to 506
W.S. PCB: Water Source Unit PCB (PCB1)
Alarm
Code
Abnormality of Power Supply Phase