C Troubleshooting - Vaillant ecoTEC plus Series Operating Instructions Manual

Appendix
C Troubleshooting
Fault
Product does not start The gas isolator cock installed on-site and/or the gas
up: isolator cock on the product is closed.
The power supply in the building is disconnected.
–
No hot water
–
Heating remains cold
The product is switched off.
The heating flow temperature is set too low or to the
Heating off position, and/or the hot water temperature
is set too low.
The system pressure is insufficient.
Low water pressure in the heating installation (fault mes-
sage: F.22).
There is air in the heating installation.
After three unsuccessful attempts to ignite the flame, the
product switches to fault mode (fault message: F.28).
Hot water generation The external controller is not set correctly.
functioning correctly;
heating does not start
up.
14
Cause Measure
Open both gas isolator cocks.
Check the fuse in the building. The product
switches on automatically when the power is
restored.
Switch on the product (→ "Switching on the
product" section).
Set the heating flow temperature and hot water
temperature (→ "Setting the heating flow temper-
ature" section/→ "Setting the hot water temperat-
ure" section).
Fill the heating installation (→ "Filling the heating
installation" section).
Have your competent person purge the heating
installation.
Press the fault clearance key for one second.
The product makes another attempt to ignite the
flame.
If you have been unable to eliminate the ignition
fault after three fault clearance attempts, consult
a competent person.
Set the external controller correctly (→ Controller
operating instructions).
Operating instructions ecoTEC plus 0020245033_00