H9-00" - Outdoor Air Temperature Thermistor Abnormality; J3-00" - Discharge Pipe Thermistor Abnormality - Daikin FTXTA30AW Service Manual

ESIE17-19C | Part 2. Troubleshooting
Possible cause
Faulty reactor.
More info:
Check procedures
"Main PCB" on page 56
"Compressor" on page 51
"Electronic expansion valve" on page 53
2.2.2.16. "H9-00" – Outdoor air temperature thermistor abnormality
Trigger
Thermistor input voltage is > 4.96 V or
< 0.04 V when power is on.
Possible cause
Faulty outdoor air temperature thermistor.
Faulty outdoor unit main PCB.
More info:
Check procedures
"Refrigerant thermistors" on page 60
"Main PCB" on page 56
2.2.2.17. "J3-00" – Discharge pipe thermistor abnormality
Trigger
Thermistor input voltage is > 4.96 V or
< 0.04 V when power is on.
Discharge pipe temperature is lower than
the heat exchanger temperature.
Possible cause
Faulty discharge pipe thermistor.
Faulty outdoor unit main PCB.
More info:
Check procedures
"Refrigerant thermistors" on page 60
19/08/19 | Version 1.1
Optimized Heating 4
Check
Check reactor.
Replacing procedures
"Replacing main PCB" on page 95
"Replacing compressor" on page 84
"Replacing expansion valve body" on page 89
Effect
Unit will stop operating.
Check
Check outdoor temperature thermistor.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Replacing procedures
"Replacing main PCB" on page 95
Effect
Unit will stop operating.
Check
Check discharge pipe thermistor.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Replacing procedures
2.2. Error based troubleshooting
Corrective action
Replace reactor when required.
Reset
Manual reset via user interface.
Corrective action
Replace outdoor temperature thermistor
when required.
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Reset
Manual reset via user interface.
Corrective action
Replace discharge pipe thermistor when
required.
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
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