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I have a Vaillant Turbomax Plus combi of 2004 vintage. When a cold tap is used nothing happens to the boiler, but as soon as the cold tap is turned off, the boiler starts up for a short time. The hot water demand lights up and the fan (maybe also pump??) runs, but the boiler doesn't get as far as lighting (no burner lit light appears).
Do any of the experts know what causes this, and what the solution is? Thanks for any help.
Do any of the experts know what causes this, and what the solution is? Thanks for any help.