Hey all,
We have a Vaillant ecoTEC plus 831.
A couple of days ago my condensate froze over. Annoying, but no biggie and a couple of buckets of warm water later it was working again. I also noticed that the pressure relief pipe had a decent amount of ice under it, but didn't think anything of it at the time.
This morning the boiler turned off (halfway through my shower
) and it's now reporting F22 - Dry Fire. Checked the pressure and it's down to 0.3 bar. Had a hunt around the house and I can't see any leaks. I attempt to repressurise the boiler using the refill pipes and... nothing happens. No sound of water flowing, just silence. I bleed a couple of downstairs radiators and nothing happens. I've checked the expansion vessel and there's definitely air in there - although I've got no way of checking the pressure on it.
Any thoughts?