ESIE02–01 Error Codes: System Malfunctions
Part 3 – Troubleshooting 3–55
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4
5
1
4.3 Reverse Phase (U1)
Error code U1
This error code is only for 3-phase equipment.
LED indication The table below shows the LED indication.
Error generation The error is generated when the difference between phase L1 and L3 is not 240˚. The illustration below
shows the 3-phase network.
Causes The possible causes are:
■ Malfunctioning power supply wiring connection
■ Broken or disconnected power supply wiring
■ Malfunctioning outdoor unit PCB
Operation HAP (green) H1P (red) H2P (red)
Normal 688
Malfunctioning 687
12090 180
L1 L2 L3
240
240˚
270 360
L1
L3 L2
240˚
120˚
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