Daikin VRV RXYQ72-384XAYCA Service Manual page 303

SiUS342004EB
Troubleshooting
Note(s)
1. Thermistors
Discharge pipe thermistor for M1C
Compressor body thermistor
Reference
CHECK 3 Refer to page 360.
Reference
CHECK 11 Refer to page 366.
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Connect the Service Checker.
Reset the system operation,
and then restart it.
CHECK 11
Are the
characteristics of the
discharge pipe and
compressor surface
temperature
thermistors
normal?
( 1)
YES
Service Checker
Connect the Service Checker, and then make a
comparison between discharge pipe temperature (or
compressor surface temperature and low pressure
checked by the Service Checker and the
measurements of discharge pipe surface temperature
(or compressor surface temperature.)
Is the
temperature
checked by the
Service Checker same as the
measurement of the
temperature?
YES
• All thermistors are normal, and temperature detection
with the outdoor unit main PCB is also normal.
• The discharge pipe temperature (or compressor surface
temperature) has really become high.
CHECK 3 : Eliminate the causes of superheat operation.
Applicable Thermistor
NO
NO
Electric symbol Connector
R21T
X19A
(Group connector)
R14T
Troubleshooting by Error Code
Replace the relevant thermistor.
Replace the outdoor unit main
PCB (A1P).
296