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Mend Rayburn 380L Boiler Fires Circulation

how can I fix my rayburn 380L boiler?

I have a rayburn 380L LPG boiler which fires up,makes knocking noises then switches off before circulation takes place so no radiators or hot water come on.Sometimes it works ok for several days.Can I do the repair myself without flushing or does it mean new heat exchanger.If so how much should I expect to pay.

Larry Yori
February 2010
RayburnRayburn 380LHeating, Home Heating SystemsBoiler Fires Circulation

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Rayburn 380L Boiler Repair - Knocking & Cut Out