Daikin RXQ12AHR Service Manual page 236

Troubleshooting by Error Code
Troubleshooting
Note(s)
1. Thermistors
Discharge pipe thermistor
(for M1C)
Discharge pipe thermistor
(for M2C)
Compressor body thermistor
(for M1C)
Compressor body thermistor
(for M2C)
Reference
CHECK 3 Refer to page 289.
Reference
CHECK 11 Refer to page 295.
230
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 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
RXQ6-14A
Electric
Connector
symbol
R21T
—
X19A (Group
connector)
R8T
—
SiAF341904E
Replace the relevant thermistor.
Replace the outdoor unit main
PCB (A1P).
RXQ16-20A
Electric
Connector
symbol
R21T
R22T
X19A (Group
connector)
R8T
R9T
Part 6 Service Diagnosis