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Hi its a Suprima 40L, it was installed by the builders when the house was built around 5 years ago.

I have a problem with the central heating not coming on when it should. The hot water is working fine, but when I switch on the central heating, it runs for about 2 minutes, then switches off. If I keep the heating on for 1 min, then turn the thermostat down to 5, the heating switches off as...