Troubleshooting SiMT041311E147 Service Diagnosis2.19 Input Overcurrent DetectionError Code E8Method of ErrorDetectionAn input overcurrent is detected by checking the input current value with the compressorrunning.Error DecisionConditionsThe current exceeds 21 A for 2.5 seconds with the compressor running.(The upper limit of the current decreases when the outdoor temperature exceeds a certainlevel.)SupposedCauses Outdoor temperature is out of operation range. Defective compressor Defective power module Defective outdoor unit PCB Short circuitTroubleshootingCheck No.15Refer to P.185Check No.17Refer to P.188Check No.18Refer to P.188CautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.∗ An input overcurrent may result from wrong internal wiring. If the system is interrupted by an inputovercurrent after the wires have been disconnected and reconnected for part replacement, check thewiring again.(R20441)NOYESYESNOStart operation and measure theinput current.Check No. 18Check the discharge pressure.Check No. 17Check No.15Check with the inverter analyser.Turn off the power and disconnectthe harnesses U, V, and W.Turn off the power and reconnectthe harnesses. Turn on the poweragain and start operation.Check the installation condition.Replace the outdoor unitPCB.Correct the power supply orreplace the outdoor unitPCB.Any LED off?Input current flowingabove its stop level?∗ Inverter analyser:RSUK0917CNO Correct the power supply.YESIs thepower supply voltagefluctuation within ±10% fromthe rated value?
