00No communication between control panel and heater, or
control panel error
First, remove fuses 15 A (red cable) and 5 A. Then put in fuse 15A (red cable), followed by fuse 5 A.
Check connections of control panel.
Check fuse 15 A (red cable).
Check wiring harness.
Contact a Webasto Service Centre.
01No start (after 2 attempts to start) Check fuel supply (enough fuel, at least 8 ltr.; check fuel connection and tubes), reset heater (by
switching off for at least 30 sec.)
02Flame failure
Restart not successful
See fault message 01
03Under voltage or over voltage Charge battery or connect to another power source (12 V DC),
reset heater (by switching off for at least 5 sec.)
04Fuel pump disconnection/short circuit/overheating Check fuel pump cable and connectors, check for overheating (see faults 06 and 07), reset heater (by
switching off for at least 5 sec.)
05Hot air motor fault: disconnection/short circuit/fan speed
out of range/fan blocked
Ensure that hot air fan can rotate freely, remove possible blocking
objects, reset heater (by switching off for at least 5 sec.)
06Overheating or exceeding gradient water temperature
sensor
Check water level, reset heater (by switching off for at least 5 sec.) or select winter mode, heating
without hot water production
07Overheating or exceeding gradient hot air temperature
sensor
Ensure that hot air can flow freely, air intake and outlets are not blocked.
Reset heater (by switching off for at least 5 sec.)
08Overheating of heaters' control unit Ensure that cooling air can flow freely,
reset heater (by switching off for at least 5 sec.)
09Combustion air motor fault: disconnection/short circuit/
overload/blocked
Ensure that cooling fan can freely rotate, remove possible blocking objects.
Check fuse 15 A (red cable).
10Control unit fault/heater locked Put heater back into service (see beginning of paragraph) and restart heater.
Contact a Webasto Service Centre.
11Interior temperature sensor disconnection or short circuit Check routing of cable, avoid that it is pinched or crushed, check the connector behind the control
panel.
Reset heater (by switching off for at least 5 sec.)
12Hot air temperature sensor disconnection/short circuit Reset heater (by switching off for at least 5 sec.)
Contact a Webasto Service Centre.
13Water temperature sensor disconnection/short circuit See fault message 12
14Glow plug/flame detector disconnection/short circuit See fault message 12
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