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my vaillant 630 boiler flashes f61?

my vaillant 630 boiler keeps flashing f61 and f27
andy, December 2009
Short circuit/earth (ground) leak in cable harness to gas valves, gas
valve assembly defective (earth/ground leak from coils), electronic
control system defective

b, December 2009
link Click here to see other fixes for Vaillant.