York IDM030B21E Series Service Manual page 64

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