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How can I fix my Ideal Isar combi boiler, heating ok no hot water?

What could be causing the hot water side of my Ideal Isar combi to not work, when the central heating side is ok?

E Spink
March 2007
check wether the diverter valve (grey plastic box with a lever in the middle)is moving as the heads have a tendancy to fail.
when selected for hot water by drawing off the hot tap the valve should be seen to move, if it doesnt the system is stuck in the heating position and will not provide hot water.

watknig
March 2007

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