Thanks for the advice, I'll try it when I get home tonight. It might not dip too low again but I wanted to be armed in case it did. The engineer who came round was about 12 years old and wanted to be in and out as quickly as possible so he didn't show me anything. Anyway, I'll let you know if I...
The pressure keeps dipping on my Baxi Combi Instant 105e. Last time it dipped so low it conked out. It's starting to slide again but as the engineer who came didn't seem to have to do a lot to get it sorted, I wondered if it was something I could sort myself - is it just a case of turning a tap...