Webasto Air Top Evo 3900 Operating Instructions Manual - page 6
The error code is communicated by a series of flashes from the status LED in the bottm right
corner of the bezel. After a sequence of 5 fast flashes the error code will be communicated
by a series of long flashes; refer to the table below for code explanations.
Example:
F 03 =
If serious faults, such as overheating or no start, occur frequently, the heater will be set to
permanent fault lock-out (F 12) and cannot be restarted until it has been repaired by
Webasto-trained personnel.
Error code
Meaning
F 00
Control unit error
F 01
No start (after 2 starting attempts)
F 02
Flame failure (at least > 3)
F 03
Undervoltage or overvoltage
F 04
Premature flame recognition
F 06
Temperature sensor interrupt or
temperature sensor short circuit
F 07
Metering pump interrupt or metering pump
short circuit
F 08
Fan motor interrupt or
fan motor short circuit or
fan motor overload or blocked
F 09
Glow plug interrupt or
glow plug short circuit
F 10
Overheating
F 11
Overheating sensor interrupt or overheating
sensor short circuit
F 12
Heater unit lock-out
F 14
Overheating sensor installed incorrectly
F 15
Setpoint generator short circuit
Error code output on combination timer or control element
Pause
Pause