Johnson Controls HVWHP072B32S - Abnormality of High Pressure Sensor

SM-18006
3-77
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outputvoltageofthepressuresensordecreasesto0.1Vorless,or
increasesto4.9Vormoreduringoperation.
Is connector CN7
of W.S. PCB abnormal?
Is 5 VDC applied between
#1 and #3 of connector
CN7 of W.S. PCB?
Yes
Yes
Is voltage under 0.1 VDC
or over 4.9VDC between
#2 and #3 of connector
CN7 of W.S. PCB?
Is access port clogged?
Failure of
high pressure sensor
Connect it correctly.
Failure of W.S. PCB
Yes
No
No
No
No
Failure of W.S. PCB
Replace access port.
Yes
W.S.PCB: WaterSourceUnitPCB(PCB1)
Alarm
Code
AbnormalityofHighPressureSensorforWaterSourceUnit
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor
on Top of
Compressor
Check resistance.
Replace thermistor
if faulty.
Failure
Indicated Value of
Pressure Value
is Excessively
High or Low
Replace access port.
Malfunction of Pressure
Sensor due to Faulty
Access Port
Check wiring to
W.S. PCB.
Repair wiring and
connection.
Incorrect Connection
Replace W.S. PCB
and check operation.
Replace W.S. PCB
if faulty.
Failure of W.S. PCB
Check for clogging
of access port.