Vaillant ecoTEC plus Operating Instructions Manual page 16

Appendix
Fault
Product does not There is a fault in the flue gas route.
start up:
– No hot water
– Heating re-
mains cold
Heating does not The external controller is not set cor-
start. rectly.
16
Cause
Operating instructions ecoTEC plus 0020200872_00
Measure
Have a competent person rectify
the fault.
Set the external controller cor-
rectly (→ Controller operating in-
structions).