13
Operating manual atmoCRAFT
The unit can only be re-started if the heating system has
sufficient water in it (see Section 4.8.7).
Caution!
If the fault signal F.20 is shown repeatedly, an
authorised heating engineer must be consulted
to carry out a check of the system.
4.8.3 Ignition problems
1
Fig. 4.13 Fault resolution
If the burner fails to ignite after three attempts, the
device does not start up and switches to "
Fault"
. This is
indicated by the fault code
"F.28"
or
"F.29"
in the
display.
• First check whether the stop-cock in the gas line is
open.
Automatic ignition can only take place after you
manually reset the fault.
• To reset the fault, press the "reset" button (
1
) and hold
it down for approx. one second.
Caution!
Inappropriate alterations can cause damage!
If your gas boiler still does not start after the
third attempt, you must call a suitably qualified
heating engineer for help.
4.8.4 Fault caused by exceeding the temperature
1
2
Abb. 4.14 Releasing after STB switch-off
Your boiler is equipped with a safety temperature limiter
(STB) which automatically switches off the boiler if the
temperature gets too hot. This fault is displayed by the
fault code
"F.20"
.
• Remove the front cover.
• Release the STB by pushing the pin (
1
).
• Reset the electronic system by pushing the "Reset"
button (
2
).
Caution!
If the fault signal F.20 is shown repeatedly, an
authorised heating engineer must be consulted
to carry out a check of the system.
4.8.5 Faults with the exhaust gas removal
The Vaillant atmoCRAFT units can be equipped with an
exhaust gas sensor (accessories). If the exhaust gases
are not removed properly, the unit switches off
temporarily in order to prevent the escape of exhaust
gas into the room where the boiler is located.
The display shows the symbol "Fault in air/exhaust gas
route". The unit starts up again automatically after
approx. 15-20 minutes after this switch-off.
After repeated switch-off (max. three failed attempts)
the unit does not start up again. The error message
"
F.36
" appears in the display.
Operation 4
GB
