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>1. With the HW on and CH off, does the tank thermostat switch the boiler off if you turn it down? YES >2. To test the HW valve, let the system cool down. Turn on the heating and leave HW off. Do the pipes to the HW tank get hot? YES >3. Or that immersion might be on NO Therefore the...

There is a switch next to the Hot Water storage tank with a white cable going into it. I was advised that this switch can be turned ON to heat the water in the storage tank when the boiler is not working. Do you call it immersion? This switch is OFF as I have never turned it ON. In that case...

Out of these possibilities, it is not 1. I just tried it and the hot water tank thermostat is able to start or stop water heating. How do I test 3? >1. With the HW on and CH off, does the tank thermostat switch the boiler off if you turn it down? >2. To test the HW valve, let the system...

Thanks for prompt replies. I need to debug the problem and post a reply.

Since a few days I am finding the hot water to be very hot. Since the wash basins have separate hot and cold taps the hot water feels burning hot. The house is newish build (8 years old). Gas Central Heating is definitely not Combi type. There is a storage tank on the first floor and I was told...