Johnson Controls HVWHP072B32S - Page 75

SM-18006
3-55
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 alarm
code, the water source unit number of abnormal inverter PCB and abnormal inverter PCB number are
displayed on the 7-segment display of the water source unit PCB.
Note 1: Except for some models.
Wheninsufcientvoltageisdetectedbetweenterminals“P”and“N”oftheinverterPCBthreetimesin
30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three times in
30 minutes, the operation automatically restarts.
■208/230VType
Does the voltage fall
during operation when
other equipment or
devices are powered on?
The connections
between inverter PCB (INV),
main power PCB (MPB) and
reactor (DCL) are correct.
Also, other connections for
inverter PCB (INV) are correct.
Is LED501A on
main power PCB (MPB)
ON after compressor's
relay (RY) turn ON?
Check main power
PCB (MPB).
3
Restart operation.
Check wiring and
wire sizes.
Connect it correctly.
Replace main power
PCB (MPB).
1
Yes
Yes
Check the wiring,
inverter PCB (INV) and
main power PCB (MPB).
1, 2
HIGH VOLTAGE
Yes
Yes
Normal
Fault
Yes
Frequency can
increase higher
than 60Hz.
Compressor stops
immediately.
(lower than 30Hz)
Compressor stops
when frequency
increase. (Approx.
31Hz to 60Hz)
How is
compressor
operation?
Is the DC voltage
over 250V?
Yes
No
No
No
No
No
No
Faulty inverter PCB (INV).
Replace it.
1
Faulty main power PCB (MPB).
Replace it.
Normal
Abnormal
Check main power
PCB (MPB).
3
Faulty Inverter PCB (INV)
Replace it.
1
Is the power supply voltage 208V+10% or
230V+10% ?
Is the power supply voltage more than 177V?
HIGH VOLTAGE
Alarm
Code
AbnormalInverterVoltage
(InsufcientInverterVoltageorOvervoltage)