Immergas MAGIS M4-30 Use And Installation page 131

Supervision
Error
System Error Operation or protection anomaly
Code
Code
F1 116 Low voltage protection on DC bus.
L0 134 Compressor inverter module fault.
L1 135 Low voltage protection on DC bus.
L2 136 High voltage protection on DC bus.
L4 138 MCE operation anomaly.
L5 139 Zero speed protection.
Phase sequence fault (only three-
L7 141
phase models).
Frequency variation of compressor
L8 142
higher than 15Hz within 1 second.
The actual frequency of the compres-
L9 143 sor differs from the target frequency
by over 15Hz.
Cause of fault and corrective action
1. Check power supply.
2. If the power supply is OK, check whether the LED light is OK,
check whether PN voltage is 380V, the problem usually comes from
the main board. Furthermore, if the light is OFF, disconnect power,
check the IGBT, check the diodes. If voltage is not correct or the
inverter board is damaged, change it.
3. If there is no problem with IGBT, it means that there are prob-
lems on the board of the inverter. Check the rectifier jumper. (Same
method as IGBT: disconnect power, check whether or not the diodes
are damaged).
4. Usually, if F1 is displayed when the compressor is started, it likely
depends on the main board. If F1 appears when the fan is started, it
could be due to the board of the inverter.
1. Check the pressure of the heat pump system.
2. Check the phase resistance of the compressor.
3. Check the connection sequence of the power line U, V, W between
the inverter board and the compressor.
4. Check the connection of the power line L1, L2, L3 between the
inverter board and the filter board.
5. Check the board of the inverter.
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