York IDM030B21E Series Service Manual page 58

TROUBLESHOOTING
Other
Abnormalities
Event
Indoor Fan
Speed is
Not Changed
No Defrosting
Operation Mode
is Available
while Heating
Operation or
Defrosting
Operation is
Continued
Light and
LCD Indication
on Wired Zone
Controller
are Kept ON
*1): For CIW01, refer to Section 3.1.4 (3).
*2): Refer to Section 3.1.4 (2).
3-36
Cause
Failure of
Failure of
Thermistor
Discharge
Air Temp.
Disconnected
Thermistor
Wire of
Thermistor
Failure of
Failure of
Wired Zone Controller Wired Controller
Failure of
Indoor Unit PCB
Failure of
Failure of
Thermistor
Thermistor
for Outdoor
Evaporating
Disconnected
Temp. during
Wire of
Heating
Thermistor
Disconnected
Reversing
Valve Coil
Failure of
Reversing
Incorrect
Valve
Activation of
Reversing
Valve
Disconnected Control Wires
between Indoor Unit and
Outdoor Unit
Disconnected
Wire to PCB
Failure of
Outdoor Unit
PCB
Failure of
PCB
Disconnected
Wire to PCB
Failure of
Indoor Unit
PCB
Failure of
PCB
Failure of PCB in Indoor Unit
Failure of PCB in Indoor Unit
or Wired Controller or Wired Zone Controller
Abnormalities of Devices
Check Item
Check Thermistor in
Check thermistor in
Self-Checking mode *2). self-checking mode *2).
Check it in Check it in
self-checking mode *1).
Self-Checking mode *1).
Measure resistance
of coil.
Supply power forcibly.
Check connectors.
Check connectors.
Check it in
Check it in
self-checking mode *1).
Self-Checking mode *1).
Check connectors.
Check PCB in Check PCB in
self-checking mode *1).
Self-Checking mode *1).
Action
(Turn OFF Main Switch)
Replace or correctly
connect wires
if abnormal.
Replace wired
controller if faulty.
Replace PCB if faulty.
Replace or correctly
connect it if abnormal.
Replace reversing valve.
Correctly connect
wires.
Correctly connect
wires.
Replace it when check
mode is not available.
Correctly connect
wires.
Replace PCB if faulty.
SM-16005-rev.2