ESIE16-02K
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Part 2. Troubleshooting
2.2. Error based troubleshooting
Page 22
31/05/21
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Version 1.1
RA R32 Split & multi split M-Series
2.2.1.3. “A1-01” – PCB abnormality
2.2.1.4. “A5-00” – Freeze-up protection / Heating peak cut control
Trigger
Effect
Reset
The system cannot set the internal set-
tings
Unit will stop operating.
Power reset via outdoor unit.
Possible cause
Check
Corrective action
Wrong models interconnected
Check if unit combination is official.
Refer to ‘Combination database’.
Install compatible models.
Faulty wiring.
Check the connection of all terminals by
disconnecting and reconnecting all termi-
nals.
Replace wire harness/terminal when con-
nection is not OK.
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 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
• during cooling operation, indoor heat
exchanger temperature is below 0°C
(freeze-up protection control).
• during heating operation, indoor heat
exchanger is above 65°C (heating
peak-cut control).
Unit will stop operating.
Automatic reset when temperature is
within range.
Possible cause
Check
Corrective action
Air short-circuit.
Check if the airflow around the unit is OK
and there are no obstructions.
Remove obstruction.
Clogged air filter.
Check if the air filter is clogged.
Clean the air filter.
Dust accumulation on indoor heat
exchanger.
Check if indoor heat exchanger is
dirty/dusty.
Clean the indoor heat exchanger.
Faulty indoor heat exchanger thermistor.
Check indoor heat exchanger thermistor.
Replace indoor 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.
