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.....just thinking, could it be the expansion vessel hose is blocked? Would this explain the difference in pressure (boiler display and analogue gauge in airing cupboard) and would this cause the symptoms described? It would also explain why the prv and expansion vessel appeared fine to the...

Thanks for the reply, Tony. My boiler supposedly has Frost Protection - "The boiler has a built-in frost protection programme.....this device operates the burner and system pump when the temp inside the boiler falls to 3degrees....." As it's a built-in "programme" - how on earth do I test...

.....Hi, back again! Ok, So I've had GlowWorm out and they replaced a faulty ignition unit and a couple of rubber gaskets around the burner (that had perished - apparently, if left it could have ended in a fire - nice). Whilst they were out they checked and re-checked the PRV and the...

Good stuff, that's one less thing to worry about at the moment then. However, I am still confused about "stuff"..... Basically, the pressures seem ok again now - hovering around 1bar when cold and towards 2bar when hot. So, is there something specific about a very cold night (and the boiler...

Thanks for the quick reply, Tony. Sorry, I'd skimmed through the FAQs but had not associated my symptoms with those that you have highlighted for me.....I think I was focused on the trees and not seeing the wood. My fault. So.....having re-read the Expansion Vessel bit (FAQ 31) it does...

Hi there, I am perplexed. If anyone has any ideas on the following, I'd really appreciate it: I have a Glowworm Ultracom 18sxi high-efficiency condenser boiler located in my garage, and for 2 years it has worked fine. However, twice now (before Christmas and this morning!) it has failed to...