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Status / Error message Possible cause Correction
A50 Fan inverter Internal fan fault.
Please contact your authorised Webasto Marine dealer.
A51 PFC module inverter Module fault. Excess current C1, C2: connections short-circuited.
A53 STO inverter
Internal module fault “Safe Torque Off”. No contact between "Safe
Torque Off" connection and pc-board.
A54 STO inverter
No display on screen; compressor
and sea water pump not running.
Fuse faulty or break/short-circuit in this electrical circuit.
Pc-board damaged by high voltage (RT1 blown).
Sea water pump(s) start up direct-
ly after the control is switched on.
Wiring of pump 1 (sea water) and pump 2 (cold water) interchanged.
Please contact your authorised Webasto Marine dealer.
Compressor keeps cutting in and
out.
Shortage of cold water.
No or insufficient cooling or heat-
ing capacity.
Poor air or water flow, soiled or circulation blocked.
Secure adequate air or water flow
(see A01 and/or A02).
Refrigerant shortage.
Please contact your authorised Webasto Marine dealer.
Oil block.
Refrigerant circuit blocked. (Filter or expansion valve).
Compressor fault.
Incorrect room/ambient tempera-
ture or water temperature dis-
played.
Temperature sensor positioned incorrectly, subject to interference or
display values falsified.
Check whether the sensor is subject to direct fault sources such as
direct sunlight or devices radiating heat. Please contact your author-
ised Webasto Marine dealer.
Compressor not running.
The target temperature of the cold water is reached. No correction
necessary:
0°C (cooling mode), 49°C (heating mode).
The system starts up on reaching a defined cold water temperature.
Cut-in temperature::
4°... 8°C (cooling mode), 41°... 45°C (heating mode).
Compressor defective or break/short-circuit in compressor wiring.
Please contact your authorised Webasto Marine dealer.
Compressor 2: Compressor overload or overload protection element
on top of compressor defective.
Incorrect compressor settings.
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