Appendix
0020220342_01 ecoTEC plus Operating instructions 13
C Troubleshooting
Fault Cause Measure
Product does not start
up:
– No hot water
– Heating remains cold
The gas isolator cock installed on-site and/or the gas
isolator cock on the product is closed.
Open both gas isolator cocks.
The power supply in the building is disconnected. Check the fuse in the building. The product
switches on automatically when the power is
restored.
The product is switched off. Switch on the product (→ "Switching on the
product" section).
The heating flow temperature is set too low or to the
Heating off position, and/or the hot water temperature
is set too low.
Set the heating flow temperature and hot water
temperature (→ "Setting the heating flow temper-
ature" section/→ "Setting the hot water temperat-
ure" section).
The system pressure is insufficient.
Low water pressure in the heating installation (fault mes-
sage: F.22).
Fill the heating installation (→ "Filling the heating
installation" section).
There is air in the heating installation. Have your competent person purge the heating
installation.
After three unsuccessful attempts to ignite the flame, the
product switches to fault mode (fault message: F.28).
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.
Hot water generation
functioning correctly;
heating does not start
up.
The external controller is not set correctly. Set the external controller correctly (→ Controller
operating instructions).
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