13
Operating manual ecoCRAFT 0020058717_03
4.7 Troubleshooting
Should problems arise while operating your gas con-
densing boiler, you can check the following points your-
self:
No hot water, heating stays cold; Appliance does not
start:
- Is your house stop cock in the gas supply or the gas
stop on the appliance open (see Section 4.2.1)?
- Is the power supply switched on?
- Is the main switch on the gas-fired condensing boiler
switched on (see Section 4.3)?
- Is the rotary knob for setting the flow temperature
on the gas-fired condensing boiler not turned fully
anti-clockwise, i.e. frost protection active
(see Section 4.4)?
- Is the filling pressure of the heating system sufficient
(see Section 4.2.2)?
- Is there air in the heating installation?
- Is there an ignition problem (see Section 4.7.2)?
Hot water operation, no problem; Heating does not
start:
- Has the external controller (e.g. calorMATIC or auro-
MATIC controller) signalled a heat requirement (see
Section 4.5.4)?
a
Caution!
Inappropriate alterations can cause damage!
If your gas-fired condensing boiler still does not
work properly after you have checked the above
points, you must call a suitably qualified heat-
ing engineer to check it over.
4.7.1
Faults due to low water pressure
As soon as the system pressure falls below a limit, the
service message "
Check water pressure
" appears in
the display. Provided the heating engineer has topped
up with sufficient water, the display goes out automati-
cally after 20 seconds. If the pressure falls below 0.3
bar the unit shuts off. The error message "
F.22
" ap-
pears in the display. To return the unit to normal opera-
tion, the heating engineer must first top up the system
with water. Below 0 bar, i.e., if the sensor is defective,
the Vaillant assured comfort mode is activated.
If the pressure drops frequently the reason for the loss
of hot water must be identified and eliminated by a rec-
ognised expert technician company.
4.7.2 Faults
in
ignition
1
2
Fig. 4.11 Troubleshooting
If the burner fails to ignite after five attempts, the unit
will not operate and switches to "
Fault
". This is indicat-
ed by the fault code "
F.28
" or "
F.29
" in the display.
On ecoCRAFT units, the flame symbol with a cross (
1
)
and a corresponding plain text message also appear in
the display, e.g. for F.28: "
Failure during starting, igni-
tion unsuccessful
".
Automatic ignition can only take place after you manu-
ally reset the fault.
• In this case, press the fault suppression button (
2
)
and hold it down for roughly one second to reset the
fault.
a
Caution!
Inappropriate alterations can cause damage!
If your gas-fired condensing boiler does not
start after the third attempt, you must consult
a suitably qualified heating engineer to have it
checked over.
4.7.3 Faults in the air/flue gas routing
The appliances are fitted with a blower. If the blower
does not work properly, the appliance will switch itself
off.
The
and
symbols as well as the error message
"
F.3x
" appear in the display. The displayed fault code is
additionally explained by a corresponding plain text
message in the display, e.g.: "
Fan fault
"
.
Operation 4
