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Home heating system?

We have a Vaillant eco TEC plus boiler 2 years old. There is a F76 code and the boiler won't fire up, what is the problem?

Steve
March 2009
VaillantHeating, Home Heating SystemsHeating Boiler Fire
F.76 Overheating protection on primary heat exchanger triggered
Cable or cable connection of fuse in the primary heat exchanger
defective, or primary heat exchanger defective

a
March 2009

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