Rectifying Low Water Pressure; Resolving Ignition Faults - Vaillant VU GB 806/5-5 Operating Instructions Manual

5.4

Rectifying low water pressure

Caution.
b
Tap water that is extremely calciferous
or corrosive or contaminated by chemi-
cals can cause material damage.
Unsuitable tap water damages the seals
and diaphragms, blocks components in the
boiler and heating installation through
which the water flows and causes noise.
> Only fill the heating installation with suit-
able heating water.
> In case of doubt, consult your competent
person.
0,7
5.2 Display of the filling pressure for the heating installation is
too low
If the filling pressure for the heating installation falls below
0.08 MPa (0.8 bar), the red bar display and the current fill-
ing pressure flash in the display.
If the pressure falls below 0.05 MPa (0.5 bar), the boiler
switches off and the fault message F.22 appears in the dis-
play. To restart the boiler, you must refill the heating instal-
lation with treated water (¬ section 4.6.3 and 4.6.4).
As soon as the system has been topped up with sufficient
water, the message disappears automatically after approx.
20 seconds. If the pressure drops frequently,the reason for
the loss of hot water must be identified and eliminated
> Contact your competent person.
If the heating installation extends over several storeys, a
higher filling pressure may be required for the heating
installation.
> Ask your competent person for details about this.
To fill up and to re-fill the heating installation, you can nor-
mally use tap water. In exceptional cases, however, the
water quality may not be suitable for filling the heating
installation because the water is highly corrosive or calcif-
erous.
> If this is the case, contact your competent person.
Operating instructions ecoTEC plus 0020134822_01
bar
5.5

Resolving ignition faults

Caution.
b
Risk of damage due to improper modifi-
cations.
Improper modifications or persistent faults
can result in material damage.
> If you are unable to resolve the ignition
problem yourself by resetting the boiler
three times, consult your competent per-
son.
Failure in start up
Igntn unsuccessful
5.3 Fault clearance
If the burner fails to ignite after five attempts, the boiler
will not operate and switches to "Fault". This is indicated by
the display of fault codes "F.28" or "F.29" (1) and an accom-
panying plain text display in the display., e.g. for F.28: "Fail-
ure during start-up, Ignition failed" (2).
On Vaillant ecoTEC plus boilers, a crossed-out flame symbol
is also displayed along with the relevant plain text in the
display, e. g. for F.28:
"Failure in start up: Igntn unsuccessful" (2). The boiler will
only ignite automatically again once you have reset it man-
ually.
> To reset the boiler manually, press the reset button (3)
and hold for one second.
Troubleshooting
F.28
5
1
2
3
19