Vaillant error F.67

12 Apr 2015
Reaction score
United Kingdom
Hi everybody !

I just (semi-succesfully) replaced the circulation pump on our Vaillant Combi Boiler, but during a first testrun a fitting blew off (overpressure valve on pump wasn't fully seated, my bad) and soaked the whole boiler and tripped the main differential in the house.
I immediately started blowdrying the PCB (which wasn't all that wet to begin with), but I fear it got damaged by the power surge of the tripped differential.
Since then every attempt to start up hangs up on error F.67 . I hear a "tssk" - sounding like a spark, there's also a click from the white high voltage thingy to ignite the flame, but then it's F.67 .

- So is a power outtage enough to kill this PCB ?
- Is the error solely situated in the PCB or did I somehow burn out a sensor somewhere also?
- If I install a new PCB : how much trouble am I getting myself into to program it again, or do these come with some decent factory settings to start from ?

all help is welcome
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It just started working again ! (?)
Hot water from the tap, and burner is now heating the water for the central heating. I f nothing explodes I think it might just work out...
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If everything still works tomorrow i shall make a chocolate offering to the plumbing gods

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