York IDM030B21E Series Service Manual page 60

TROUBLESHOOTING
Other
Abnormalities
Event
Insufficient
Cooling
Operation
3-38
Cause
Insufficient
Airflow to
Outdoor Unit
Heat
Exchanger
Excessively
High Air
Temp. to
Outdoor Unit
Heat
Exchanger
Excessively
Charged
Excessively
Refrigerant
High
Discharge
Non-
Pressure
Condensable
Gas in Cycle
Clogging of
Discharge
Piping
Failure or
Malfunction
of Expansion
Valve
Malfunction or Internal
Leakage from Reversing Valve
Failure of
Solenoid
Valve
for Bypass
Excessively
Low Suction
Malfunction
Pressure
or Internal
Leakage from
Reversing
Valve
Discharge Temp. of
Indoor Unit is Unstable.
Abnormalities of Devices
Check Item
Check clogging of
outdoor unit
heat exchanger.
Obstacles at inlet or
outlet of outdoor unit
heat exchanger?
Is service space for
outdoor unit sufficient?
Correct fan speed?
Short-circuited
outdoor unit air
outdoor unit
Any other heat load
near outdoor unit?
Check expansion valve
opening.
Check each temp.
and pressure.
Check for clogging.
Check for clogging.
Check for connecting
wire and connector.
Is there operation
sound from coil?
Is thermistor on
compressor normal?
Is thermistor installed
correctly on
compressor?
Check temp. difference
between inlet and outlet
of reversing valve.
Check leakage from
solenoid valve.
Check temp. difference
between inlet and
outlet of reversing valve.
Check for expansion
valve of indoor unit in
the same system.
Action
(Turn OFF Main Switch)
Remove clogging.
Remove obstacles.
Secure sufficient
service space.
Replace fan motor.
Remove cause of
short-circuit.
Remove heat source.
Correctly charge
refrigerant.
Charge refrigerant
after vacuum pumping.
Remove clogging.
Remove clogging.
Replace connector.
Replace coil.
Replace thermistor.
Correctly install it.
Replace reversing valve.
Replace solenoid valve.
Replace reversing valve.
Replace failed
expansion valve of
indoor unit.
SM-16005-rev.2