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We have a Halstead Aces High combi boiler. Every time we run hot water (or switch on the central heating), it burns for a few seconds, then the pressure gauge fluctuates rapidly and it switches off (and the lockout LED switches on). The pressure looks to be stable (at 1 bar) when it's not...

My Halstead Ace High boiler was working fine until today... When I turn it on, the burner ignites, but then it turns off after a couple of seconds - and the power light flashes. The pressure is also exceptionally low... This sounds like something I should be able to fix myself - by just...