Operating instructions

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Operating instructions ecoTEC plus 0020124810_FT1b
6.3 Rectifying a water shortage
b
Caution!
Tap water that is extremely calciferous or
corrosive or contaminated by chemicals
can cause material damage!
Unsuitable tap water damages the seals and
diaphragms, blocks components in the boiler
and heating system through which the water
flows and causes noise.
> Only fill the heating system with suitable
tap water.
> In case of doubt, consult your approved
heating engineer.
As soon as the fill pressure falls below a limit, the
service message "Check water pressure" appears in the
display.
The filling pressure must be between 1.0 bar and 2.0 bar
when the system is cold in order for the heating system
to operate properly (¬ see section 4.3.3).
> If the fill pressure is lower, then top it up with water
(¬ section 4.3.4).
As soon as the system has been topped up with
sufficient water, the message disappears automatically
after approx. 20 seconds.
If the system falls below a pressure of 0.5 bar, the boiler
will switch off. The error message "F.22" appears in the
display. The system must be topped up with water before
the unit can be put into operation again. If the pressure
drops frequently the reason for the loss of hot water
must be identified and eliminated
> Contact your heating engineer.
If the heating system extends over several storeys, the
system may require a higher filling pressure.
> Ask your approved heating engineer about this.
To fill up and to refill the heating system, you can
normally use tap water. In exceptional cases, however,
the water quality may not be suitable for filling the
heating system because the water is highly corrosive or
calciferous.
> If this is the case, contact your approved heating
engineer.
6.4 Resolving ignition faults
b
Caution!
Risk of damage due to improper alterations!
Improper alterations or persistent faults can
result in material damage.
> If you are unable to resolve the ignition
problem yourself by resetting the boiler
three times, then consult your heating
engineer.
Failure in start up
Menu
F. 2 8
Igntn unsuccessful
1
2
3
Fig. 6.2 Troubleshooting
If the burner fails to ignite after five attempts, the boiler
will not operate and switches to "Fault". This is indicated
by the fault code "F.28” or "F.29” (1) on the display.
On Vaillant ecoTEC plus boilers, a struck through flame
symbol is also displayed along with the relevant plain
text in the display, e. g. for F.28: "Failure during starting,
ignition unsuccessful" (2).
The boiler will only ignite automatically again once you
have reset it manually.
> To reset the boiler manually, press the reset button
(3) and hold for one second.
Troubleshooting 6