Midea V4 Plus

R410A DC Inverter VRF V4 Plus W Series 50Hz MCAC-VTSM-2016-04
202 Troubleshooting
3.2 E1：Phase sequence error
Note:
If the wiring connection of each outdoor unit is according to A, B, C phase sequence, when the quantity of outdoor units is large,
the current difference between C phase and A, B phase will be very large for the power supply load of each outdoor unit is on C
phase, it is very easy to lead to air switch break and wiring terminal burnout. So when the quantity of outdoor units is large, the
phase sequence should be staggered, then the current can be distributed to the three phases equally.
E1: Phase sequence error
The 3-phase sequence of power supply is
wrong. (The A, B, C terminal of three-phase
power supply should meet compressor phase
sequence requirement. If the phase
sequence is adverse, the compressor will
operate inversely.
Exchange any two of the
3-sequence
Some power supply terminals are
loose, if there has phase loose, the
compressor will operate abnormally,
and the current is very large
Fasten each phase joint of
power supply.
The power voltage supply is abnormal,
or the null line and the live line are
connected in reverse
Check the power supply
equipment and adjust the
power supply wiring.
Outdoor main PCB
is damaged
Replace the outdoor
main PCB
No
No
No
Yes
Yes
Yes