ESIE16-02K
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Part 2. Troubleshooting
2.2. Error based troubleshooting
31/05/21
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Version 1.1
Page 41
RA R32 Split & multi split M-Series
2.2.3.4. “U4-00” – Transmission abnormality between indoor unit and outdoor unit
More info:
2.2.3.5. “U5-00” – Malfunction of transmission between indoor unit and remote controller
No self-correction possible.
Outdoor temperature below 5°C.
Check wiring and piping in the usual man-
ner.
More than 3 wrong connections.
Check piping & wiring match.
Check wiring and piping in the usual man-
ner.
No correct wiring.
Check piping & wiring match.
Correct wiring.
Trigger
Effect
Reset
Data sent from outdoor unit cannot be
received normally, content of the send
data is abnormal.
Unit will stop operating.
Power reset via outdoor unit.
Possible cause
Check
Corrective action
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.
Wiring abnormality between indoor unit
and outdoor unit.
Check wiring between indoor unit and out-
door unit.
Adjust wiring between indoor unit and out-
door unit when required.
Replace wiring between indoor unit and
outdoor unit 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.
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Faulty outdoor fan motor.
Check the fan motor.
Check fan motor connections and wiring.
Replace fan motor when required.
Adjust wiring when required.
Faulty indoor 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 indoor main PCB receives
power.
Restore the power to the indoor main
PCB.
Replace indoor main PCB when HAP LED
is not blinking in regular intervals.
Standby electricity saving mode is ON but
there is a sky-air indoor installed on the
unit.
If the indoor unit is NOT a sky-air indoor.
This mode is only compatible with split
indoor units.
Put “standby electricity saving function”
OFF (see installation manual).
Check procedures
Replacing procedures
"Replacing main PCB" on page 85
"Replacing DC fan motor assembly" on page 80
Trigger
Effect
Reset
Data from indoor unit cannot be send to
wired controller and vice-versa.
Unit cannot be controlled by the wired
controller.
If the connection is correct the unit will
start itself.
Possible cause
Check
Corrective action