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boiler keeps switching off?

boiler keeps switching off ,red light on and hot water runs hot for 90 seconds then runs cold for 7o seconds meaning that you never get a hot bath, takes 45 seconds before you get hot water into the kitchen ?
steve, October 2012
You also have shut main water going in boiler and drain system ,since you doing it change hot water sensor has well

ltd, October 2012
Replace hot water heat exchanger or to cut down on cost take out and clean with sprit of salt you have to drain system to replace

ltd, October 2012