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D.000 setting maybe set to auto, which is the target kw setting. Sometimes if it's set to auto I've found in bigger properties it doesn't always reach it's target temperature.

You might notice a difference in the winter due to the temperature of the water coming into the property. The boiler will give a temperature rise of say 30 degrees at 12lpm for example. So in the summer when water is at 15 degrees-ish you will have (15+30) 45 degree water, in the winter the...

What type of system are we talking about? Open vent or unvented? If you don't want to hire a power flusher what I'd be doing is taking of each pipe of the rads that aren't heating and attaching them to a hose from a tap and try cleaning them out that way individually, obviously leave a drain...

If it's needed a new expansion vessel it could have damaged the valve seat on the PRV, making it pass slightly. You can put a bag over the pressure relief pipe outside to see if there's anything dripping out of it, and if there is, is it enough to cause a pressure drop? If nothing comes out you...

Yeah that's normal. Just means that there's heating demand at the same time as you're running the water.

The diff valves and divertor valves often clog up on these. Sounds like the pin that is in the divertor valve, but operates the diff valve is stuck or choked up and it's going off because the boiler is reaching temperature but not transfering all it's heat to the DHW. You could pull the diff...

60 degree light is the pump fault IIRC. You'll need to check pressure, auto air vent is open, pump proving pin and switch and the pump itself obviously.