SiME332106E
Troubleshooting by Error Code
Part 6 Service Diagnosis
209
Troubleshooting
Connect the Service Checker.
Mount a pressure gauge on the
high pressure service port.
Reset the operation, and then
restart the operation.
Stop the relevant indoor units while
the system is in cooling operation,
and then check for the liquid pipe
temperature of these indoor units
after the system is stabilized.
The liquid pipe
temperature is low
(equivalent to the evaporating
temperature).
Clean the air filters
of the indoor units.
NO
YES
NO
Replace the indoor
electronic expansion
valve.
Replace the suction pipe
thermistor.
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Are the
characteristics of the
suction pipe thermistor
normal?
NO
Replace the discharge
pipe thermistor.
Are the
discharge pipe
thermistor characteristics
normal?
YES
NO
Replace the high
pressure sensor
(S1NPH).
Are the high
pressure sensor
characteristics
normal?
Service Checker
Use the Service Checker to find indoor units
operating under the following conditions:
&
• Gas pipe temperature (R3T) - Liquid pipe temperature (R2T) < 2.5°C
• Electronic expansion valve opening < 300 pulse
