Johnson Controls HVWHP072B32S - Page 103

SM-18006
3-83
TROUBLESHOOTING
Electrical Box Thermistor (THM14)
(Attached on Inner Upper Side
of Electrical Box)
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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ashort(0.2kΩorless)oropensensor(840kΩormore)isdetected
duringoperation.
Yes
Yes
Connect them.
No
No
Is thermistor THM14
connected to THM14
(Ts, color: white) of
W.S. PCB?
Is resistance of
THM14 between
0.2k
Ω and 840k Ω ?
Failure of
Thermistor
Failure of W.S. PCB
Refer to "Alarm Code 24"
for thermistor resistance.
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor for
Electrical Box
Temp.
Check resistance.
Replace thermistor
if faulty.
Failure
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
W.S.PCB: WaterSourceUnitPCB(PCB1)
Alarm
Code
AbnormalityofElectricalBoxThermistor