Daikin REYQ-TA Series, Service Manual

Page: 233 / 324

SiUS371614E Troubleshooting by Error Code
Service Diagnosis 220
Troubleshooting
Note:
∗
1. Thermistors
Refer to page 277.
Refer to page 282.
NO
Is the
“temperature”
checked by the
Service Checker same as
the measurement of the
temperature?
NO
Replace the relevant thermistor.
Replace the outdoor unit main
PCB (A1P).
YES
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 temperature (or
“compressor surface temperature.”)
Connect the Service Checker.
Reset the system operation,
and then restart it.
Are the characteristics
of the discharge pipe and
compressor body
thermistors
normal?
(
∗
1)
• 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.
CHECK 11
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Applicable Thermistor
REYQ72TA REYQ96-120TA REYQ144-168TA
Electric
symbol
Connector
Electric
symbol
Connector
Electric
symbol
Connector
Discharge pipe (M1C)
thermistor
R2T
X19A
(Group
connector)
R21T
X19A
(Group
connector)
R21T
X19A
(Group
connector)
Discharge pipe (M2C)
thermistor
— — R22T R22T
Compressor body
thermistor
R14T
X19A
(Group
connector)
— — R14T
CHECK 3
CHECK 11