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boiler DHW go hot then cold?

my raven heat boiler as just started going hot and cold on DHW. tryed all the normal without taking a spanner or screw driver to it yet

dave the rave
December 2010
Raven HeatHeating, Home Heating SystemsHeating Hot Water Raven Heat
blocked heat exchangers can cause this sort of problem

A1
December 2010

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Raven Heat Boiler Hot & Cold Water - Help