Johnson Controls HVWHP072B32S - Abnormality of Low Pressure Sensor

SM-18006
3-81
TROUBLESHOOTING
l
 TheRUNindicator(red)ashes.
l
 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
is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.
Faulty Low
Pressure Sensor
Check output voltage
is correct.
Replace pressure
sensor if faulty.
Failure
Indicated Value of
Pressure Value
is Excessively
High or Low
Check for clogging
of access port.
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.
Faulty W.S. PCB
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Is connection CN8
of W.S. PCB abnormal?
Is 5 VDC applied between
#1 and #3 of connector
CN8 of W.S. PCB?
Is voltage under 0.1 VDC
or over 4.9 VDC between
#2 and #3 of connector
CN8 of W.S. PCB?
Yes
Yes
Is access port clogged?
Failure of
Low Pressure Sensor
Connect it correctly.
Failure of W.S. PCB
Yes
No
Failure of W.S. PCB
No
No
No
Replace access port.
Yes
W.S.PCB: WaterSourceUnitPCB(PCB1)
Alarm
Code
AbnormalityofLowPressureSensorforWaterSourceUnit