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My poterton netaheat boiler 10/16 is making a buzzing noise when on?

When the flame has been on full for approx half an hour the buzzing starts. Is this an alarm? What should I do?
Andy Cook, December 2005
i think you may find its the solenoid on the gas valve, nothing to worry about, just anoying, mind you it might pack up eventually

garry, December 2005
link Click here to see other fixes for Potterton Netaheat 10/16.