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Was told to disconnect frost sensor to no avail,boiler is run through a timer but cannot see this being the problem,any ideas...thanks

Would be grateful for any advice......can only get hot water from my combi when central heating is on....rather hot for that at the moment! Was led to think it was the diverter valve so I replaced that at a lot of expense and knuckle bashing. Before I think about changing either the microswitch...