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Ravenheat RFS84ET combi boiler runs hot and cold?

Hi,

My Ravenheat RSF84ET combi boiler is in good working condition and heats water well and to a good temperature but when I run my shower the water switches between hot and cold on 30 second intervals.

Can anyone help please?
Mark, September 2008
if it does not do that to tap water could it be a shower fault perhaps?

iain, September 2008
link Click here to see other fixes for Ravenheat.