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I have an Ariston Euro Combi Boiler SX20. I have had an on going problem with my hot water only working when the heating is on. I have changed the diaphragm on the diverter valve and checked the triple micro switch on top of the diverter valve. I have now noticed that opposite the diverter...

I have an Ariston Euro Combi Boiler SX20 MFFICE The hot water only works when the heating is on. I have changed the diaphragm but this has made no difference. When I switch the micro switches manually the boiler fires up but when the hot water tap is turned on nothing happens. The pin from...

I have an Ariston Euro Combi Boiler SX20. When the boiler is set on hot water only sometimes the hot water works other times it just runs cold. When the boiler is set to heating and water it works fine. Any ideas, please help.