C4-00" - Liquid Pipe Thermistor For Heat Exchanger Abnormality; C9-00" - Suction Air Thermistor Abnormality - Daikin FTXTA30AW Service Manual

ESIE17-19C | Part 2. Troubleshooting
Possible cause
Faulty adaptor PCB.
Faulty indoor PCB.
External factory (e.g. electrical noise)
(cause when error is reset after power
reset, and error happens again after a
while).
Internal wiring is not OK.
2.2.1.9. "C4-00" – Liquid pipe thermistor for heat exchanger abnormality
Trigger
Thermistor input is > 4.96 V or < 0.04 V
during compressor operation.
Possible cause
Faulty liquid pipe thermistor.
Faulty indoor unit main PCB.
More info:
Check procedures
"Refrigerant thermistors" on page 60
2.2.1.10. "C9-00" – Suction air thermistor abnormality
Trigger
Resistance value is out of range.
T measured < -43.6°C or > 90°C.
Possible cause
Faulty suction air thermistor.
Page 22
Optimized Heating 4
Check
Check if the adaptor PCB is installed.
Check if the connector X8A on the adap-
tor PCB is not circuited.
Check the wire harness.
Check if error still occurs after turning off
power and turning it back on again.
Check if the indoor PCB receives power.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the wiring to indoor PCB.
Check for source which could cause elec-
trical interference.
Check if wiring between PCB's is correct
(refer to wiring diagram).
Effect
Unit will stop operating.
Check
Check liquid pipe thermistor.
Check if error still occurs after turning off
power and turning it back on again.
Check if the indoor PCB receives power.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the wiring to indoor PCB.
Replacing procedures
Effect
Unit will stop operating.
Check
Check suction air thermistor.
2.2. Error based troubleshooting
Corrective action
Adjust when required.
Adjust power to the indoor PCB.
Replace indoor PCB when HAP LED is
not blinking in regular intervals.
Install correct spare part or update indoor
PCB.
Adjust wiring to indoor PCB when
required.
Avoid electrical interference.
Correct wiring.
Reset
Power reset via outdoor unit.
Corrective action
Replace liquid pipe thermistor when
required.
Adjust the power to the indoor main PCB.
Replace indoor main PCB when HAP LED
is not blinking in regular intervals.
Reset
Automatic reset when resistance is within
range.
Corrective action
Replace suction air thermistor when
required.
19/08/19 | Version 1.1