16
Fault
code
Description Possible cause Correction
Display
A23 Excess
temperature,
compressor.
COOLING MODE:
-Insucient 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 com-
plied with. Clean sea water
strainer and bleed sea wa-
ter circuit. 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.
HEATING MODE:
-Cold water pump
defective.
-Plate heat exchang-
er or cold water
circuit blocked.
-Refrigerant circuit
blocked.
Check sea water flow rate
at sea water outlet. The
minimum flow rate must
be maintained. Clean sea
water strainer and bleed
sea water circuit. 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 au-
thorised Webasto Marine
dealer.