2020 MXZ Multi-Zone Tech Manual

Specifications subject to change without notice. 33 Test Run Error List Countermeasures for Error During Test Run Check code Trouble Detected Unit Remarks Indoor Outdoor Remote Controller 0403 Serial communication error Outdoor unit Multi controller board ~ Power board communication trouble 1102 Compressor temperature Check delay code 1202 1302 High pressure Check delay code 1402 1500 Superheat due to low discharge temperature Check delay code 1600 1501 Refrigerant shortage Check delay code 1601 Blocked valve in cooling mode Check delay code 1501 1503 Indoor HEX freezing protection 1508 4-way valve trouble in heating mode Check delay code 1608 2500 Water leakage 2502 Drain over flow protection 2503 Drain sensor abnormality 4100 Compressor current interruption (locked compressor) Check delay code 4350 4210 Compressor overcurrent interruption 4220 Voltage shortage/overvoltage/PAM error/L1open phase/ power synchronization signal error Check delay code 4320 4230 Heat sink temperature Check delay code 4330 4250 Power module Check delay code 4350 4400 Rotational frequency of outdoor fan motor Check delay code 4500 5101 Air inlet thermistor trouble (TH21) or Compressor temperature thermistor (TH4) open/short Check delay code 1202 5102 Liquid pipe temperature thermistor trouble (TH22) Suction pipe temperature thermistor (TH6) open/short Check delay code 1211 5103 Gas pipe temperature thermistor trouble (TH23) 5105 Outdoor liquid pipe temperature thermistor (TH3) open/ short Check delay code 1205 5106 Ambient thermistor (TH7) open/short Check delay code 1221 5109 HIC pipe temperature thermistor (TH2) open/short Check delay code 1222 5110 Heat sink temperature thermistor (TH8) open/short Check delay code 1214 5201 High pressure sensor (63HS) Check delay code 1402 5202 Low pressure sensor (63LS) Check delay code 1400 5300 Primary current Check delay code 4310 5701 Contact failure of drain float switch 6600 Duplex address error Only M-NET Remote controller is detected 6602 Transmission processor hardware error Only M-NET Remote controller is detected 6603 Transmission bus BUSY error Only M-NET Remote controller is detected 6606 Signal communication error with transmission processor Only M-NET Remote controller is detected 6607 No ACK error Only M-NET Remote controller is detected 6608 No response frame error Only M-NET Remote controller is detected 6831 MA communication receive error (no receive signal) Only MA Remote controller is detected 6832 MA communication send error Only MA Remote controller is detected 6833 MA communication send error Only MA Remote controller is detected 6834 MA communication receive error Only MA Remote controller is detected 7100 Total capacity error 7101 Capacity code error 7102 Connecting excessive number of units and branch boxes 7105 Address setting error 7130 Incompatible unit combination Note: When the outdoor unit detects No ACK error/No response error, an object indoor unit is treated as a stop, and not assumed to be abnormal. ● Self-diagnosis function The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch (SW1) and LED1, LED2 (LED indication) found on the multi-controller of the outdoor unit. LED indication : Set all contacts of SW1 to OFF. ● During normal operation The LED indicates the drive state of the controller in the outdoor unit. *SV2 is not equipped to MXZ-8C48NA. Bit 1 2 3 4 5 6 7 8 Indication Compressor operated 52C 21S4 SV1 SV2* — — Always lit [Example] When the compressor and SV1 are turned during cooling operation. 1 4 2 5 76 3 8 ● If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the air conditioning system will automatically cease operating. Determine the nature of the abnormality and apply corrective measures.