13 Faults BlueCool S Series
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13 Faults
13.1 Troubleshooting
If faults occur, the system must be switched off.
13.2 Faults displayed on digital display
Certain faults are displayed directly on the digital display as
a code. At the same time, the air-conditioning system stops.
Each time one of these fault codes appears, the system is
stopped for approx. 60 seconds and then a restart is
attempted. If the same fault occurs more often than 6 times
consecutively within 30 minutes, the system is completely
shut down and the fault code is displayed continuously. No
further restarts are attempted and the user must reset the
system by switching it off or by temporarily interrupting the
power supply of the system.
AAA: Undervoltage
Switch-off in case of undervoltage.
Power supply below set undervoltage value for longer than
5 seconds. Cause is probably excessively long power cable,
overloading or an insufficiently high power generator
output.
Measures:
Check setting (default setting: 195 V). Do not set below
195 V to prevent damage to the compressor and
subsequently voiding of the warranty.
Ensure a better power supply.
If necessary, retrofit Soft Starts which result in a lower start-
up current and therefore a lower voltage drop.
A01: Switch-off of compressor due to low pressure
• Pressure switch defective or power circuit interruption/
short circuit.
Measures:
Check electrical wiring.
Replace pressure switch on Schrader valve.
• Cooling mode:
Air supply insufficient
Measures:
Check air supply.
Difference between air inlet/air outlet temperature of
evaporator at least 4 K.
• Heating mode:
Sea water flow rate insufficient or sea water too cold
(Temperature below 6 °C).
Sea water strainer blocked or no intake.
Measures:
Check flow rate of sea water circuit at sea water outlet.
Difference between inlet-/outlet temperature of
evaporator at least 4 K.
At sea water temperature < 6 °C: no heating possible in
reverse heating operation.
Clean sea water strainer and bleed sea water circuit.
• Refrigerant shortage.
Measures:
Check for refrigerant leak.
A02: Switch-off of compressor due to high pressure
• Pressure switch defective or power circuit interruption/
short circuit.
Measures:
Check electrical wiring.
Replace pressure switch on Schrader valve.
• Cooling mode:
Sea water cooling insufficient.
Sea water strainer soiled or no intake.
Measures:
Check flow rate of sea water circuit at sea water outlet.
The minimum flow rates must be complied with.
Clean sea water strainer and bleed sea water circuit.
CAUTION
Troubleshooting only by professionals!
Troubleshooting requires comprehensive
knowledge on the design and operation of the
individual components of the air-conditioning
system and may only be carried out by
authorised professionals trained by Webasto for
this purpose.
CAUTION
Use only genuine spare parts!
Always use genuine Webasto spare parts to
ensure fault-free operation of the air-
conditioning system.
Table 7 Fault codes
Code Designation
AAA Undervoltage
A01 Switching off compressor due to low pressure
A02 Switching off compressor due to high pressure
A09 Fault in cabin temperature sensor
A10 Fault in evaporator temperature sensor
INIT Initialisation procedure or system blocked
tA11 Status code dropping below/exceeding of mini-
mum or maximum evaporator temperature
respectively
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