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Mend Ravenheat RSF 100 Rsf Heating

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
RavenheatRavenheat RSF 100Heating, Home Heating SystemsRavenheat Rsf Heating
or the plate heat exchanger is blocked if the thermistor is ok

craig
January 2006
look for a thermistor

mike
January 2006

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Ravenheat RSF 100 Boiler - Hot Water Issues