Fault Code Displayed In Control Element - Webasto Air Top Evo 55 Manual

Troubleshooting
5.4

Fault code displayed in control element

If serious malfunctions, such as overheating or failure to start,
occur with increasing frequency, then the heater is
permanently locked out and can only be returned to
operation following repairs by Webasto-trained
professionals.
When equipped with a combination timer, a fault code
output appears on the display after a malfunction occurs until
the heater malfunction has been eliminated.
Fault Fault (group)
code
F 00 Control unit defective/
heater lock-out/
internal room temperature sensor
defective
F 01 No start/no flame formation
F 02 Flame abort
F 03 Undervoltage or overvoltage
F 04 Premature flame detection
503
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In case of equipment with a rotary selector or an Air Top Evo
Multi Control the fault code is displayed by means of a
flashing operating indicator after a malfunction occurs .
After five short signals, the long flashing pulses are counted.
The flashing pulses match the number in the table below (e.g.
F 04 = 4 long flashing pulses).
For equipment with combination timer:
Fault codes F 01 to max. F 15 are displayed.
After this the faults are displayed with "- -".
Additional information during PC di-
agnostic
01 Control unit error
81 EOL checksum error
11 Incorrectly coded control unit or incorrect
heater (fuel type) installed (the heater will not
work if this error occurs)
91 Neutrally coded or disabled control unit
(the heater will not work if this error occurs)
92 Maintain command failed (no operation if
fault occurs)
18 Customer bus defective
07 Heater lock-out active
02 Even after the restart, no flame has
formed
82 No start in test
83 Maximum feed rate exceeded
03 The flame has gone out during operation
and has not reformed after a restart attempt
84 The voltage was less than 10.5 V or 20.5
V for longer than 20 seconds
04 The voltage was more than 16 V or 32 V
for longer than 6 seconds
05 The exhaust temperature sensor
recognised a flame before combustion had
started
Fig. 503 Faults and error remedies (Page 1 of 2)
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Air Top Evo 40 / Air Top Evo 55
NOTE
Troubleshooting
Replace control unit
Delete heater lock-out:
Switch on unit and remove fuse.
Reinstall fuse after more than 2 s and switch
on unit again
Check fuel supply
(tank empty, lines blocked).
Check exhaust temperature sensor for
deposits from outside through exhaust fitting
and clean carefully if necessary.
Check evaporator mount and replace if
necessary.
Check fuel supply
(tank empty, lines blocked).
Check exhaust temperature sensor for
deposits from outside through exhaust fitting
and clean carefully if necessary.
Check evaporator mount and replace if
necessary.
Check exhaust temperature sensor and
replace if necessary.