Instruction manual

13Operating 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