14
Fault
code
Description Possible cause Correction
Display
A20 Maximum
pressure level
reached.
HEATING MODE:
-Cold water pump
defective.
-Plate heat exchang-
er or cold water
circuit blocked.
-Refrigerant circuit
blocked.
Remove blockage at sea
water inlet. The minimum
flow rates must be com-
plied with. Clean sea water
strainer and bleed sea
water circuit. Operate the
unit for 5 minutes in cool-
ing mode (if possible) then
switch to heating mode
and check whether the
fault occurs again. Please
contact your authorised
Webasto Marine dealer.
A21 Excess current
at inverter.
Excess current
caused by under-
voltage. Insucient
voltage supply.
Cause is probably
excessively long
cable, overloading
or an insuciently
high power genera-
tor output.
Improve voltage supply or
activate ECO mode.
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