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Marvelous - gives me something else to try tomorrow - thank you. incidentally to the first replier is there something that can be put into the boiler re hard water as it is a particular problem where i live?

Thanks for the prompt reply Yes it is a hard water area - fernox [or similar] was put in originally.

Good people out there some advice please. Ravenheat rsf100et been installed for approx 4 yrs - no problems. Suddenly dhw cycling on / off. [ch working just fine] Dhw temp set midway. Get manual out and follow instructions - switch to hot water only. Take cover off and watch boiler flame...