York CIDH018B21S, Service Manual

Page: 49 / 186

SM-18001-rev.1
3-27
TROUBLESHOOTING
Alarm
Code
Abnormality of Thermistor for Indoor Unit Outlet Air Temperature
(Outlet Air Thermistor)
l
The RUN indicator (red) flashes.
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 indoor unit
number and the alarm code are displayed on the 7-segment display of the outdoor unit PCB.
Note 1: Except for some models.
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. The operation automatically restarts when the malfunction is
removed.
Yes
Connect them.
No
Refer to "Alarm Code 11"
for thermistor resistance.
Failure of I.U. PCB
Is thermistor THM2 (for
outlet air temp.) connected
to THM2 of I.U. PCB?
Yes
Failure of
Thermistor
No
Is resistance of THM2
between 0.24k Ω and
840k Ω ?
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Outlet Air
Thermistor
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
● High Static Type: (H,Y)IDH018 - 048B21S
● Medium Static Type: (H,Y,C)IDM006 - 048B21S ● Slim Type: (H,Y,C)IDS006 - 018B21S
Thermistor for
Air Outlet Temperature
Thermistor for
Air Outlet Temperature
Thermistor for
Air Outlet Temperature