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illiminate high screeching noise on ignition?

vaillant ecotec plus 428 open vent condensing boiler, makes a high screeching noise on ignition and stays for a short while before dying out. Rang Vaillant and was told to adjust throttle to adjust co2 level, no joy as yet, any other suggestions please.would be grateful. thanks pete.

brazure
November 2011
VaillantHeating, Home Heating SystemsHigh Noise Ignition
suspect flue fan bearing

A1
November 2011

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