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how can i fix my combi boiler ravenheat rsf 100?

heating is working fine but when i turn on hot water it keeps goin hot and then cold then hot then cold,can anybody help please
ste, January 2006
or the plate heat exchanger is blocked if the thermistor is ok

craig, January 2006
look for a thermistor

mike, January 2006
link Click here to see other fixes for Ravenheat RSF 100.