York HIDS006B21S Service Manual page 60

TROUBLESHOOTING
Other
Abnormalities
Event
Insufficient
Cooling
Operation
3-38
Cause
Indoor Heat Load is Larger
than Cooling Capacity
Gas Leakage
or Shortage
of Refrigerant
Excessively
Small
Diameter
Tube or
Long Piping
Incorrect
Activation of
Check Valve
of Outdoor
Unit
Failure or
Malfunction
of Electronic
Expansion
Valve
Excessively
Low Suction
Pressure
Clogged
Strainer in
Indoor Unit
Clogging at
Low Pressure
Piping
Clogging at
Low Pressure
Piping
Insufficient
Airflow to
Indoor Unit
Heat
Exchanger
Excessively
Low Air
Temp. to
Indoor Unit
Heat
Exchanger
Activation of
Motion Sensor Control
Abnormalities of Devices
Check Item
Calculate heat load.
Measure superheat.
Measure and check
field-supplied pipes.
Check whether or not
temp. difference exists
before/after check valve.
Check for any clogging.
Check connection
cord and connector.
Is there operation
sound from coil?
Is thermistor on
compressor normal?
Is thermistor
installed correctly on
compressor?
Check temp. difference
at inlet and outlet of
strainer.
Check temp. difference.
Check for clogged
air filter.
Check for obstacle at
inlet or outlet.
Insufficient revolution
of indoor unit fan motor?
Check short-circuited
indoor unit air.
"Motion Sensor is
activated" is indicated
on Wired Controller
Action
(Turn OFF Main Switch)
Use a larger unit.
Correctly charge
refrigerant after
repairing gas leakage.
Use correct pipes.
Replace check valve
for outdoor unit.
Remove clogging.
Replace connector.
Replace coil.
Replace thermistor.
Correctly install it.
Replace strainer in
indoor unit.
Remove clogging.
Clean air filter.
Remove obstacles.
Replace fan motor.
Remove cause of
short-circuited.
It is normal.
SM-18001-rev.1