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ESIE17-08
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Part 2. Troubleshooting
2.2. Error based troubleshooting
Page 32
15/11/18
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Version 1.1
R32 Sky-Air RZAG-M
2.2.2.8. “H3-00” – High pressure switch abnormality
2.2.2.9. “H4-00” – Low pressure switch abnormality
2.2.2.10. “H9-00” – Outdoor air temperature thermistor abnormality
Trigger
Effect
Reset
High pressure switch is activated when
compressor is off.
Unit will stop operating.
Manual reset via user interface.
Possible cause
Check
Corrective action
Stop valve is closed.
Check if stop valve is open.
Open stop valve when required.
Faulty outdoor unit main PCB.
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.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Faulty outdoor inverter PCB.
Check outdoor inverter PCB.
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
Check if the power supply is conform with
regulations.
No fluctuations in frequency.
Adjust power supply when required.
Power reset via outdoor unit.
Faulty high pressure switch.
Check high pressure switch.
Replace the high pressure switch.
Faulty capacity adapter on outdoor PCB.
Check if the correct adapter is installed.
Check if the correct spare part is installed.
Adjust capacity adapter when required.
Trigger
Effect
Reset
When there is no continuity in the low
pressure switch during compressor start.
Unit will stop operating.
Automatic reset.
Possible cause
Check
Corrective action
Refrigerant shortage.
Check for refrigerant shortage. Refer to
the nameplate for the correct charge.
Charge the correct refrigerant amount
when required.
Stop valve is closed.
Check if stop valve is open.
Open stop valve when required.
Faulty outdoor unit main PCB.
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.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Faulty expansion valve.
Check the expansion valve.
Replace the expansion valve body or
motor when required.
Faulty low pressure switch.
Check low pressure switch.
Replace low pressure switch.
Trigger
Effect
Reset
Thermistor input voltage is > 4.96 V or
< 0.04 V when power is on.
Unit will stop operating.
Manual reset via user interface.