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Status / Error message Possible cause Correction
A21 Excess current inverter
Excess current caused by undervoltage. Insufficient power supply.
Cause is probably excessively long cable, overloading or an insuffi-
ciently high power generator output.
Improve power supply or activate ECO mode.
A22 Excess temperature inverter Ambient temperature too high or insufficient cooling.
Check whether the air vents in the electrical box are blocked.
Remove dust deposits from the heat sink. The max. ambient temper-
ature must not exceed 60 °C.
A23 Excess temperature com-
pressor 1
Incorrect temperature measurement. Please contact your authorised Webasto Marine dealer.
Compressor switches off in cooling mode, maximum compressor
temperature reached. Sea water cooling insufficient. Sea water
strainer soiled or no flow. Sea water pump defective. Refrigerant cir-
cuit blocked.
Remove blockage at sea water inlet. The minimum flow rates must
be complied with. Clean sea water strainer and bleed sea water cir-
cuit. Operate unit for 5 minutes in heating mode (if possible) then
switch to cooling mode and check whether the fault occurs again.
Please contact your authorised Webasto Marine dealer.
A24 High pressure sensor Pressure sensor defective or power circuit interruption/short circuit.
Please contact your authorised Webasto Marine dealer.
A25 Low pressure sensor Pressure sensor defective or power circuit interruption/short circuit.
A26 Compressor temperature
sensor
Compressor temperature sensor defective or break/short-circuit in
electrical circuit.
A27 Data communication in-
verter
No data communication between inverter and pc-board.
A28 Characteristic diagram
Compressor operation outside characteristic map. Incorrect pressure
sensor measurement.
Compressor operates outside the characteristic diagram in cooling
mode, maximum pressure reached. Insufficient sea water cooling.
Sea water strainer soiled or no flow. Sea water pump defective;
refrigerant circuit blocked.
Remove blockage at sea water inlet. The minimum flow rates must
be complied with. Clean sea water strainer and bleed sea water cir-
cuit. Operate the unit for 5 minutes in heating mode (if possible)
then switch to cooling mode and check whether the fault occurs
again. Please contact your authorised Webasto Marine dealer.
Compressor operates outside the characteristic diagram in heating
mode, maximum pressure reached. Cold water pump defective. Plate
heat exchanger or cold water circuit blocked. Refrigerant circuit
blocked.
Check cold water flow rate and increase if necessary. Difference
between evaporator inlet/outlet temperature approx. 5K. Operate
chiller unit for 5 minutes in cooling mode (if possible) then switch to
heating mode and check whether the fault occurs again. Please con-
tact your authorised Webasto Marine dealer.
A30 Excess temperature inverter The permissible temperature in the inverter housing is exceeded.
Check whether the air vents in the electrical box are blocked.
Remove dust deposits from the heat sink. If possible, reduce the
max. ambient temperature to below 60 °C.
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