Can anyone help? The boiler seems to be doing its usual thing but it's not burning any oil, so the heating and HW are not on. I've bled the line from the oil tank to the boiler, and also bled the central heating pump - liquid coming out of both but still no joy. The oil tank ran dry which has maybe caused the problem ... it was refilled this morning.
I'd second the idea it might be a blockage caused by sludge. We're always given dire warnings by our oil tank maintenance company about the dangers of letting the tanks run dry. I think you might need to get professionals onto this.
Wine, I have had the same problem. You will have to call the boiler chap out I fear. It'll be crap lodged somewhere in the system. Tricks for getting it free have thus far surpassed my knowledge. Get another jumper on and give them a ring. I do feel for you, this never seems to happen in our house in July!
Thanks ... problem is that the boiler is outdoors and completely enclosed in a metal box that has to be unscrewed to open it. I'm not sure it's safe to tinker, though I have asked an electrician friend what he thinks. I don't think the boiler is damaged by sludge etc because it does seem to be firing as usual - it just seems that there is no oil reaching it.
We did this once (first winter in the house after moving from a place with gas heating). Ending up having to have some bits in the boiler replaced as gunk from the bottom of the tank had got into the boiler. Cost a few £100 to fix I seem to remember. Heating guy advised us not to go lower than 300l in the tank in future (our tank take 3300l).