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ESIE17-08
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Part 2. Troubleshooting
2.2. Error based troubleshooting
Page 26
15/11/18
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Version 1.1
R32 Sky-Air RZAG-M
2.2.1.6. “C4-00” – Liquid pipe thermistor for heat exchanger abnormality
2.2.1.7. “C5-00” – Intermediate heat exchanger thermistor abnormality
2.2.1.8. “C9-00” – Suction air thermistor abnormality
External factory (e.g. electrical noise)
(cause when error is reset after power
reset, and error happens again after a
while).
Check for source which could cause elec-
trical interference.
Avoid electrical interference.
Internal wiring is not OK.
Check if wiring between PCB’s is correct
(refer to wiring diagram).
Correct wiring.
Trigger
Effect
Reset
Thermistor input is > 4.96 V or < 0.04 V
during compressor operation.
Unit will stop operating.
Power reset via outdoor unit.
Possible cause
Check
Corrective action
Faulty liquid pipe thermistor.
Check liquid pipe thermistor.
Replace liquid pipe thermistor when
required.
Faulty indoor unit main PCB.
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.
Adjust the power to the indoor main PCB.
Replace indoor main PCB when HAP LED
is not blinking in regular intervals.
Trigger
Effect
Reset
Resistance value is out of range.
T measured < -43.6°C or > 90°C.
Unit will stop operating.
Automatic reset when resistance is within
range.
Possible cause
Check
Corrective action
Faulty Intermediate Heat Exchanger ther-
mistor.
Check intermediate heat exchanger ther-
mistor (see
).
Replace intermediate heat exchanger
thermistor when required.
Faulty indoor PCB.
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.
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.
Trigger
Effect
Reset
Resistance value is out of range.
T measured < -43.6°C or > 90°C.
Unit will stop operating.
Automatic reset when resistance is within
range.
Possible cause
Check
Corrective action