TROUBLESHOOTING
58
Procedure
E1
↓
The phase sequence of the three-phase power
supply is incorrect (1)
YES
→
Swap any two of the 3 phase wires
NO
↓
Some power supply terminals are loose (2)
YES
→
Ensure that all power supply terminals are
connected properly
NO
↓
Power supply is abnormal
YES
→
Check the power supply grid
NO
↓
Replace the refrigerant circuit board
1 Terminals A, B, C of the three-phase power supply must correspond to the requirements of the compressor
phase sequence. If the phase sequence is reversed, the compressor will operate in reverse. If the wiring
connection of each outdoor unit is in the A, B, C phase sequence and more units are connected, the current
dierence between phase C and phases A and B will be very significant, as the power supply load of each
outdoor unit will be on phase C. In this case, it is easy for the circuits to jump and the terminals to burn
out. So if more than one unit is to be used, the phase sequence must be staggered so that the current is
distributed equally between the three phases.
2 Loose power supply terminals can cause compressors to operate abnormally with very high compressor
current.
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