Johnson Controls HVWHP072B32S - Page 87

SM-18006
3-67
TROUBLESHOOTING
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 TheRUNindicator(red)ashes.
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The indoor unit number and the alarm code are displayed on the LCD. The alarm code is displayed on
the 7-segment display of the water source unit PCB.
Thisalarmcodeisdisplayedwhenashort(0.24kΩorless)oropensensor(840kΩormore)isdetected
during a heating or cooling operation.
Refer to "Alarm Code 11"
for thermistor resistance.
Failure of I.U. PCB
Yes
Failure of
Thermistor
No
Is resistance of THM4
(for Outside Air Temperature)
between 0.24kΩ and 840kΩ?
Alarm
Code
Abnormality of Thermistor for Outside Air Temperature
(for Ducted (Medium Static) with EconoFresh Kit)
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor for
Outside Air
Temperature
Check resistance.
Replace thermistor
if faulty.
Failure
Check wiring to
I.U. PCB.
Correctly connect wires.
Incorrect Connection
Replace I.U. PCB
and check operation.
Replace I.U. PCB
if faulty.
Failure of I.U. PCB