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No Hot Water OPTIMA 701 gas combi boiler?

I get no hot water unless I have the heating on. I have cleaned the water filter, flowmeter and flow restrictor. This cured the problem but for a short time only. I did find sediment in the water supply so I flushed the boiler out by removing the blank plug on the domestic hot water outlet.
My local plumber suggests a new boiler.
I need some proper advice ?
James Roberts, September 2007
Hi james did you fix the problem on you boiler i have the same problem and have beeen advised that the 701 does not have a diverter valve.

gary117, August 2008
diverter valve diaphragm

eddy, September 2007
link Click here to see other fixes for Optima.