York CIDM030B21E, Service Manual

Page: 64 / 144

3-42
SM-16005-rev.2
TROUBLESHOOTING
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Excessively
High
Discharge
Pressure
Insufficient
Heating
Operation
Check whether short
circuit exists.
Remove cause of
short circuit.
Excessively
High Air
Temp. to
Indoor Unit
Heat
Exchanger
Check expansion valve
opening.
Correctly charge
refrigerant.
Excessively
Charged
Refrigerant
Check for clogging. Remove clogging.
Clogging of
Discharge
Piping
Check refrigerant
quantity.
Recharge refrigerant
after vacuum pumping.
Non-
Condensable
Gas in Ref.
Cycle
Check for filter clogging. Remove clogging.
Check for any obstacles
at inlet or outlet of
indoor unit.
Remove obstacles.
Check indoor fan speed. Replace fan motor.
Insufficient
Airflow to
Indoor Unit
Heat
Exchanger
Check temp. difference
between inlet and outlet
of reversing valve.
Check for refrigerant
leakage from solenoid
valve.
Excessively
High Suction
Pressure
Failure of
Solenoid
Valve
for Bypass
Replace solenoid valve.
Replace failed
expansion valve of
indoor unit.
Replace reversing valve.
Malfunction
or Internal
Leakage from
Reversing
Valve
Check temp. difference
between inlet and outlet
of reversing valve.
Replace reversing valve.
Malfunction or Internal
Leakage of Reversing Valve
Check temp. difference
between inlet and outlet
of check valve.
Replace check valve.
Malfunction of Check Valve
of Outdoor Unit
Check for expansion
valve of indoor unit
in same system.
Discharge Temp. of
Indoor Unit is Unstable.
“Motion Sensor is
activated” is indicated
on Wired Controller
It is normal.
Activation of
Motion Sensor Control
Abnormalities of Devices
Other
Abnormalities