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Thanks Bahco, will softly surjest it to the plumber when comes back in a week. I think you are right. He put cleaning agent in for a start and will remove it next week. Lex

-------------------------------------------------------------------------------- The boiler runs and works for about 20 minute and then stops, the Overheating light comes on. I follow the procedure of switching off for 10 seconds and then turning the knob back to temperature.It then works...