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Vaillant EcoTEC Plus 418 Fault F7?

Same fault as Jonnie's but with Fault code F7 - any answers.
DougW, July 2011
F7 is given as NO INFORMATION even in the extended list of Vaillant faults.
Whenever NO INFORMATION is given, it will refer to a faulty cpu on the pcb.
Basically put, you will need to replace the pcb.

Carefree, July 2011
link Click here to see other fixes for Vaillant.