Daikin RQYQ140-180PY1 Service Manual page 135

SiBE341001
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Set up a pressure gauge at
the service port on the high
pressure side.
Check if suction pipe
thermistor property is
normal.
YES
Check if discharge
pipe thermistor
property is normal.
YES
Check if high
pressure sensor
property is normal.
YES
Service Checker
Look for the following indoor unit by service checker
• Gas pipe temperature (R4T)
-Liquid pipe temperature (R3T) < 3˚C
&
• Opening degree of electronic expression
valve < 300 pls
Stop the indoor unit (the system is in cooling
operation) and check the liquid pipe temperature of
the indoor unit after the system has stabilized.
The liquid
pipe temperature is
low (equivalent to the
evaporating
temperature).
NO
Troubleshooting by Remote Controller
NO
NO
NO
YES
Replace the suction pipe
thermistor.
Replace the discharge pipe
thermistor.
Replace the high pressure sensor.
Replace the indoor unit electronic
expansion valve.
Clean the air filter of the indoor
unit.
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