Reading Fault Codes; Detecting And Rectifying Malfunctions - Vaillant ecoTEC plus Operating Instructions Manual

6.1

Reading fault codes

If a fault develops in the boiler, the display shows a fault
code starting with "F...".
A plain text display explains the displayed fault code.
Example for F.10: "Short circuit heating feed sensor".
Fault codes have priority over all other displays. If a fault
occurs, then the display no longer shows the current
heating flow temperature.
If multiple faults occur at the same time, then the
display shows the corresponding fault codes for two
seconds each in sequence.
> If your boiler displays a fault code, then contact your
heating engineer.
6.2

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
Hot water handling, no
problem;
Heating does not start:
Tab. 6.2 Detecting and rectifying malfunctions
> If after checking the points mentioned in Tab. 6.2
your boiler still shows signs of a fault, contact your
heating engineer to troubleshoot the problem.
Operating instructions ecoTEC plus 0020124810_FT1b
Possible cause
Building gas stop cock closed
Building power supply switched off
Mains switch on boiler switched off
The heating flow temperature is set too low or in the
"Heating off" position (¬ section 4.8.2) and/or the
hot water temperature is too low
Fill pressure of the heating system too low
Air in the heating system
Ignition malfunction
No heating demand via the controller
Troubleshooting 6
Solution
Open building gas stop cock
(¬ section 4.3.1)
Switch on building power supply
Switch on mains switch on boiler
(¬ section 4.3.2)
Set the heating flow temperature to the
desired temperature (¬ section 4.4) and/or
set the hot water temperature to the desired
temperature (¬ section 4.5 and 4.6)
Top up the heating system with water
(¬ section. 4.3.4)
Bleed the radiators;
If the problem occurs again:
Contact your heating engineer
Press the reset button;
If the problem occurs again:
Contact your heating engineer
(¬ section 6.4)
Check the timer programme on the controller
and correct if necessary;
Check the room temperature and correct the
target room temperature if necessary
(¬ section 4.7; Controller operating
instructions)
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