Detecting And Rectifying Malfunctions; Rectifying A Water Shortage - Vaillant ecoTEC plus Operating Instructions Manual

7.2

Detecting and rectifying malfunctions

If problems occur whilst operating your boiler, you can
carry out the following self-checks:
Problem
No hot water, heating stays
cold;
Boiler does not start
DHW mode without any prob-
lems;
Heating does not start:
7.1 Detecting and rectifying malfunctions
> If, after checking the points mentioned in Tab. 7.1, your
boiler still shows signs of a fault, contact your approved
competent person to troubleshoot the problem.
7.3

Rectifying a water shortage

0,7
7.2 Display of the filling pressure for the heating system is too
low
If the filling pressure for the heating system falls below
0.08 MPa (0.8 bar), the right-hand bar display and the cur-
rent filling pressure flash in the display.
Operating instructions ecoTEC plus 0020116701_00
Possible cause
Building gas isolator cock closed
Building power supply switched off
On/off switch on boiler switched off
The heating flow temperature is set too low or in the
"Heating off" position (¬ Section 5.6.2) and/or the
hot water temperature is too low
Filling pressure of the heating system too low
Air in the heating system
Ignition malfunction
No heating demand via the controller
bar
Troubleshooting
Solution
> Open building gas isolator cock (¬ Sec-
tion 5.1.1)
> Switch on building power supply
> Switch on the on/off switch on the
boiler(¬ Section 5.1.2)
> Set the heating flow temperature to the
desired temperature (¬ Section 5.2) and/or
set the hot water temperature to the desired
temperature (¬ Section 5.3.1 and 5.4)
> Top up the heating system with water
(¬ Section 5.1.4)
> Purge the radiators.
> If the problem occurs again:
Contact your heating engineer
> Press the reset button
> If the problem occurs again:
Contact your competent person (¬ Sec-
tion 7.4)
> Check the timer programme on the control-
ler and correct it if necessary.
> Check the room temperature and, if
required, correct the target room tempera-
ture
(¬ Section 5.5; ¬ Controller operating
instructions).
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