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vaillant 837?

hi i have a 837 vaillant with the code s7. what can it be?
tony, January 2011
'S' is a status code, basically telling you what the boiler is doing, S7 means the pump is running on after the CH has been run.

Completely normal.

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