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Metal door hinging at the bottom, with an LCD display for the temperature only. 2 knobs on the left hand side for hot water and the central heating. Timer is a Timeswitch 110...

I have moved into a house with a Vaillant combi boiler fitted, unfortunately I can't find anything telling me what model it is. The hot water dial is turned to full yet when running the water from any of the taps in the house the temperature of the water fluctuates from hot to luke warm (not...