ESIE16-02K
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Part 2. Troubleshooting
2.2. Error based troubleshooting
Page 40
31/05/21
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Version 1.1
RA R32 Split & multi split M-Series
More info:
2.2.3.3. “U3-00” – Check operation not executed or transmission error
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.
Defective DC voltage detection circuit.
Check PCB with DC voltage detection cir-
cuit.
Replace PCB when required.
Defective over-voltage detection circuit.
Check PCB with over-voltage detection
circuit.
Replace PCB when required.
Defective PAM control part.
Check PAM control part.
Replace PAM control part when required.
Faulty compressor.
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.
Replace compressor when required.
Investigate reason of breakdown.
Replace expansion valve when required.
Fix possible leak.
Faulty outdoor fan motor.
Check the fan motor.
Check fan motor connections and wiring.
Replace fan motor when required.
Adjust wiring when required.
Momentary drop of voltage.
-
Wait until compressor restarts.
Momentary power failure.
-
Wait until compressor restarts.
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 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.
Check procedures
Replacing procedures
"Replacing compressor" on page 77
"Electronic expansion valve" on page 55
"Replacing expansion valve body" on page 82
"Replacing DC fan motor assembly" on page 80
"Replacing main PCB" on page 85
Trigger
Effect
Reset
Failed wiring error check operation.
Wiring issue between indoor and outdoor.
Unit will not start to run.
To reset the error code: push SW3 (wiring
error check switch) for 10 seconds.
For more information, see installation
manual “wiring error check”.
Possible cause
Check
Corrective action
Stopped operation before finishing wiring
check operation.
Measure the voltage at the primary side of
the safety breaker.
Check that all liquid and gas valves are
fully open.
Check piping & wiring match.
Reset error code and restart wiring error
check procedure.