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We've had problems since before Christmas with our Halstead Ace High, and have had a plumber making many attempts to fix it, and still without any luck. The problem is with both heating and hot water. It does fire up for both, but often shuts down again very quickly. Sometimes it will run for...

I have a Halstead Ace High boiler running twelve radiators. They heat the house very unevenly, and there are two radiators in cupboards (a bit unnecessary I'd say), so I'd like to fit Thermostatic valves, and remove the two offending rads. Is the best method to drain the system down entirely...

I would like to desludge my heating system, but I'm not quite sure how to go about doing it with a closed system. How would I go about getting the chemicals into the system? Do I need a pump, or some other bit of equipment?

The boiler concerned is a Ferroli Optima 701. After fixing a leaking pipe, I've refilled the system but it won't maintain pressure. Having checked things out I realised it's the pressure release valve has got jammed open when I repressurised the system, and I was about to go out and buy one...