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Hi I have a vaillant ecotec pro 24 combi boiler and the hot water temp is only 40 degrees coming from the hot tap which is next to the boiler. I have replaced the NTC sensor which clips onto the DHW heat exchanger but this has made no difference. The boiler is just over 2 years old (outside...

If i switch the programmer to Gravity rather than Fully pumped will this stop the rads coming on when HW only is selected but come on when CH is selected ?

Hi all My problem is that the radiators in my flat are constantly on. I have a honeywell mid position valve which is controlled by a siemens RBW29 programmer. The original programmer was a Glowworm Mastermind. When i replaced it i noticed that there were only 4 wires to the back plate Live and...