Daikin RXYQ-TA Series Service Manual page 244

Troubleshooting by Error Code
Troubleshooting
231
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Connect the Service Checker.
Mount a pressure gauge on the
high pressure service port.
Reset the operation, and then
restart the operation.
Are the
characteristics of the
accumulator inlet thermistor
and the suction pipe
thermistor
normal?
YES
Are the
discharge pipe
thermistor characteristics
normal?
YES
Are the
high pressure sensor
characteristics
normal?
YES
Service Checker
Use the Service Checker to find indoor units operating under the following
conditions:
• Gas pipe temperature (R6T) - Liquid pipe temperature (R4T) < 2.5˚C (4.5˚F)
&
• Electronic expansion valve opening < 300 pulses
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).
NO
NO
NO
NO
YES
SiUS341615E
Replace the relevant
thermistor.
Replace the discharge
pipe thermistor.
Replace the high
pressure sensor.
Replace the indoor
unit electronic
expansion valve.
Clean the air filters
of the indoor units.
Service Diagnosis