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enheatrsf 820/20 boiler keeps turning its self on and off via the tim?

my ravenheat 820/20 combi boiler keeps turninig its self on
& off via the timer unit . what would cause this problem?
chris, December 2006
I think the battery is running low on the timer. I had similar problem and had the timer by passed and it cured it.

Gary Heiss, December 2006
link Click here to see other fixes for Ravenheat 820/20.