Vaillant ecoTEC VU Betriebsanleitung PDF herunterladen (Seite 23)

Troubleshooting

Operating instructions ecoTEC plus 0020116701_00 23

7.2 Detecting and rectifying malfunctions

If problems occur whilst operating your boiler, you can

carry out the following self-checks:

Problem Possible cause Solution

No hot water, heating stays

cold;

Boiler does not start

Building gas isolator cock closed

> Open building gas isolator cock (¬ Sec-

tion 5.1.1)

Building power supply switched off > Switch on building power supply

On/off switch on boiler switched off

> Switch on the on/off switch on the

boiler(¬ Section 5.1.2)

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

> 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)

Filling pressure of the heating system too low

> Top up the heating system with water

(¬ Section 5.1.4)

Air in the heating system

> Purge the radiators.

> If the problem occurs again:

Contact your heating engineer

Ignition malfunction

> Press the reset button

> If the problem occurs again:

Contact your competent person (¬ Sec-

tion 7.4)

DHW mode without any prob-

lems;

Heating does not start:

No heating demand via the controller

> 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).

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

0,7bar

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.

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