9
Status / Error message
Possible cause
Correction
A03
Low pressure compressor 2
Pressure switch defective or power circuit interruption/short circuit.
Please contact your authorised Webasto Marine dealer.
Cooling mode:
Cold water flow rate too low.
Check operation of the cold water pump. If fitted, open shut-off cock valves. Please contact your authorised Webasto Marine dealer.
Heating mode: - Sea water flow rate insufficient or sea water too cold (Temperature below 6 °C).- Sea water strainer blocked or no intake.
Remove blockage at sea water inlet.Check/clean the sea water strain- er.Bleed sea water circuit.
A04
High pressure compressor 2
Pressure switch defective or power circuit interruption/short circuit.
Please contact your authorised Webasto Marine dealer.
Cooling mode: Sea water cooling insufficient.Sea water strainer soiled or no intake.
Remove blockage at sea water inlet. The minimum flow rates must be complied with.Clean the sea water strainer. Bleed sea water cir- cuit.
Heating mode: Cold water flow rate too low.
Check operation of the cold water pump. If fitted, open shut-off cock valves. Difference between evaporator inlet/outlet temperature approx. 5 K. Please contact your authorised Webasto Marine dealer.
A09
Cabin temperature sensor
Cabin temperature sensor defective, break/short-circuit in electrical circuit, cabin temperature sensor not connected.
Please contact your authorised Webasto Marine dealer.
A10
Cold water temperature sensor
Cold water temperature sensor defective or break/short-circuit in electrical circuit.
A15
Cold water flow
The flow monitor identifies insufficient cold water flow 5 seconds after the cold water pump is switched on. Cold water circuit is blocked or wire break at flow monitor if the parameter "flow moni- tor" in the Deactivation menu is set to Normally open (NO).
A20
High pressure compressor 1
Incorrect pressure sensor measurement.
Please contact your authorised Webasto Marine dealer.
Compressor switches off 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 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 switches off in heating mode, maximum pressure reached. Cold water pump defective. Plate heat exchanger or cold water circuit blocked. 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 cooling mode (if possible) then switch to heating mode and check whether the fault occurs again. Please contact your authorised Webasto Marine dealer.
