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When we have the water switched on it heats the radiators?

Hi The radiators have started heating up when only the water is switched on. Not good when the weather is warm! This is a new problem it only started recently. The boiler is about 15 years old and is an Ideal Classic RS 50. Any suggestions?
Gary Halling, April 2008
A problem with your diverter valve, either stuck in mid position or stuck in ch position...

T, April 2008
link Click here to see other fixes for Ideal Classic RS 50.