DC Inverter Air
(2) Troubleshooting and Protection based on Fault Codes
H**: refers to the number of indoor units connected with the outdoor unit, which is displayed when all indoor
units are in standby state.
It displays “Dxx” when the outdoor unit is in the defrosting state;
It displays “Cxx” in the return oil state;
xx— Running frequency
E01: an incorrect communication line between indoor unit and outdoor unit.
Treatment Method:
Indoor/outdoor
communication
fault
Display
communication
fault
Reset
Replace main control panel
Display E01 on display screen of outdoor unit,
display E0 for indoor unit
(if any communication fault, it will display the fault
two minutes later after the machine is energized)
1. Bus communication of indoor/outdoor units is
intact or not ;
2. Use the shielded twisted pairs or not
3. Connection way of communication line is correct or not;
4．Is there a large‐size disturbance source in the surrounding
environment or not.
Note: The communication line connection of indoor/outdoor units refers to the chapter 3 ‐ Electrical Design.
E03: the communication fault between inverter module and main control panel of outdoor unit
Treatment Method:
1. Whether the module communication lines are reliably connected with communication interface of main
control panel (CN302);
2. Whether the module power supply is reliably connected with the filter boards L and N (220V);
3. Whether is there the large‐size disturbance source existed in surrounding environment;
4. Replace the inverter module;
5. Replace the outdoor motherboard.
E04: faulty phase sequence detected for the first energization
Treatment Method:
1. Replace the phase sequence of power supply;
2. If it still displays E04 after the replacement, it may be the problem of main control panel. It is necessary to
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