Daikin VRV EMERION RXYQ-AATJA, Service Manual

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Troubleshooting by Error Code SiUS342303E
315 Part 6 Service Diagnosis
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
unit electronic
expansion valve.
Replace the relevant
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 and the
compressor suction
thermistor normal?
NO
Replace the discharge
pipe thermistor.
YES
NO
Replace the high
pressure sensor
(S1NPH).
Are the high
pressure sensor
characteristics
normal?
Are the
discharge pipe
thermistor characteristics
normal?
Service Checker
Use the Service Checker to find indoor units operating under the following conditions:
&
• Gas pipe temperature – Liquid pipe temperature < 2.5°C (4.5°F)
• Electronic expansion valve opening < 300 pulses