Daikin REYQ-TA Series Service Manual page 233

SiUS371614E
Troubleshooting
∗1. Thermistors
Note:
CHECK 11
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 body
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 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
Discharge pipe (M1C)
thermistor
Discharge pipe (M2C)
thermistor
Compressor body
thermistor
CHECK 3 Refer to page 277.
Refer to page 282.
NO
NO
REYQ72TA
Electric Electric
Connector
symbol symbol
X19A
R2T (Group R21T
connector)
— — R22T
X19A
R14T (Group
connector)
Troubleshooting by Error Code
Replace the relevant thermistor.
Replace the outdoor unit main
PCB (A1P).
REYQ96-120TA REYQ144-168TA
Electric
Connector
symbol
R21T
X19A
(Group
connector)
R22T
— — R14T
Connector
X19A
(Group
connector)
220