Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual page 59

14.2.6 Reading fault codes
If a fault develops in the boiler, the display shows a fault
code F.xx.
A plain text display explains the displayed fault code.
Example F.10: "Short circuit in flow sensor".
Fault codes have priority over all other displays. If a fault
occurs, the display no longer shows the current heating
flow temperature of the heating installation.
If multiple faults occur at the same time, the display shows
the corresponding fault codes for two seconds each in
sequence.
> Remedy the fault.
> To restart the boiler, press the fault clearance key
(¬ Operating instructions).
> If you are unable to remedy the fault and the fault reoc-
curs despite several fault clearance attempts, contact
Vaillant Customer Service.
14.2.7 Querying the fault memory
Menu ¬ Installer level ¬ Fault list
The boiler has a fault memory.
You can use this to query the last ten faults that occurred
in chronological order. If a DCF sensor is connected, the
date on which the fault occurred will also be displayed.
The display shows:
– the number of faults that have occurred
– the fault currently selected with fault number F.xx.
– a plain text display explaining the fault
> Use the minus button
to view the last ten faults.
14.2.8 Resetting the fault memory
You can delete the entire fault list.
> Press the right-hand selection button
("Delete").
> Confirm the deletion of the fault memory by pressing the
right-hand selection button again
ecoTEC plus installation and maintenance instructions 0020134823_01
or the plus button
("OK").
Troubleshooting 14
59