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Status / Error message Possible cause Correction
A31 Excess current inverter
Current too high due to sudden changes in load, short-circuit in
motor line, incorrect parameter settings.
Please contact your authorised Webasto Marine dealer.
A32 Phase connection compres-
sor 1
Compressor, phase connection. Break in compressor connection
cable.
A33 Earth leakage current Earth fault found. Earth current too high.
A34 Excess current inverter
HW excess current. Current too high due to sudden changes in load,
short-circuit in compressor connection line, incorrect inverter param-
eter settings.
A35 DC-Bus inverter DC bus fault. No input voltage at power supply.
A36 Undervoltage inverter PFC Undervoltage “power factor correction”. Insufficient power supply.
A37 Undervoltage inverter Undervoltage due to low supply voltage or defective inverter.
A38 Compressor speed 1 Incorrect speed or incorrect parameters at too high a load.
A39 Cable bridge inverter
Compressor 1 switched off because the input is not bypassed/open.
Cable not connected. Function of external relay, 24V voltage not
applied.
A40 Compressor 1 overload
Maximum permissible current was exceeded within the defined time
window.
A41 Overvoltage
The DC voltage of the intermediate circuit has exceeded the maxi-
mum permissible value as the result of excessively long delay or over-
voltage peaks in the supply voltage.
A42 Under temperature inverter Temperature in inverter below permissible level.
A43 Excess temperature com-
pressor 1
The measured PTC thermistor temperature corresponds to a resist-
ance >2600 ohm.
A44 IGBT inverter Internal fault.
A45 CPU inverter CPU fault. Data loss in memory.
A46 Parameter inverter
Parameters were reset automatically to factory setting: User-specific
parameter setting corrupted.
A47 Data communication in-
verter
Data communication fault. Data reception faulty.
A48 Thermistor inverter Internal inverter thermistor fault.
A49 Automatic adjustment in-
verter
Automatic adjustment faulty. Incorrect parameters.
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