temperature gauge always stays at 0 when hot water or heating is on . when you turn off hot water or heating there is a noise then a click and then the pilot light goes out.also you have to top it up with water every day
The temperature gauge sensor is a bulb that is clipped to the outlet pipe from the primary heat exchanger, it must have somehow come off & need clipping back in place. If the system needs topping up every day then the water must be getting out somewhere. Watch the variation in pressure when the central heating goes from cold to hot, if it goes up more than 1/4 bar or so the expansion vessel needs pumping up, if the system pressure hits 3bar or so the overpressure valve will lift and water will go out the overflow. This is not good for the boiler. Recharging the pressure vessel is easy and explained in many places -clipping the thermometer bulb back on involves opening the sealed combustion chamber - this cant be recommended on a public BB, as it is potentially dangerous if you dont seal it back up again properly. Get a corgi man in to service it.
Download the manual pdf from the Vokera website