H8-00" - Compressor Input (Ct) System Abnormality; H9-00" - Outdoor Air Temperature Thermistor Abnormality - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting
Possible cause
Faulty outdoor inverter PCB.
Stop valve is closed.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
2.2.2.12. "H8-00" – Compressor input (CT) system abnormality
Trigger
DC voltage or DC current sensor abnor-
mality based on the compressor running
frequency and the input current.
Possible cause
Faulty outdoor unit main PCB.
Faulty power module.
Input current or compressor current too
low.
Faulty outdoor inverter PCB.
Faulty compressor.
Faulty reactor.
2.2.2.13. "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.
4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
Check
Check outdoor inverter PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check stop valve.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Effect
Unit will not stop operating.
Unit will stop operating if the warning
occurs several times.
Check
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.
Check outdoor inverter PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check compressor.
Check connections and wiring of the com-
pressor.
Check expansion valve (liquid back
issue).
Check the refrigerant charge. Refer to the
nameplate for correct charge.
Check reactor.
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.
2.2. Error based troubleshooting
Corrective action
Restore the power to the outdoor inverter
PCB.
Replace the outdoor inverter PCB when
required.
Open stop valve when required.
Adjust power supply when required.
Power reset via outdoor unit.
Reset
Automatic reset when compressor runs
normally for 60 minutes.
Manual reset via user interface.
Corrective action
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Restore the power to the outdoor inverter
PCB.
Replace the outdoor inverter PCB when
required.
Replace compressor when required.
Investigate reason of breakdown.
Replace expansion valve when required.
Fix possible leak.
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.
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