E1: Phase Sequence Error - Midea VRF V4 Plus I Series Manual

MCAC-VTSM-2014-04
5.2 E1: Phase sequence error (Display on faulty unit, all the ODU in standby)

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
sequence is adverse, the compressor will
operate inversely.
No
Some power supply terminals are
loose, if there has phase loose, the
compressor will operate abnormally,
and the current is very large
No
MC9S08AC128 chip is disabled
No
Main board is disabled
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.
Troubleshooting
requirement. If the
Yes
Exchange any two of the
phase 3-sequence
Yes
Fasten each phase joint of
power supply.
Yes
Replace main board
R410A DC Inverter V4 Plus 50Hz
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