Daikin Aurora Series Service Manual page 234

Troubleshooting by Error Code
Troubleshooting
∗1. Thermistors
Note:
CHECK 11
221
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 control 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 thermistor for M1C
Compressor body thermistor
CHECK 3 Refer to page 285.
Refer to page 294.
NO
NO
Electric symbol
R21T
R14T
SiUS341802E
Replace the relevant thermistor.
Replace the outdoor unit main
PCB (A1P).
Connector
X19A
(Group connector)
Service Diagnosis