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Was the PRV lifting then?

This wouldnt cause burner lock out. It has 2.5 bar pressure relief valve which will lift if this limit is exceeded. Your prv termination pipe will emit a flow of water to release pressure and you will then find that you have to top pressure up. If you lose pressure the low pressure warning...

Sounds like a pcb issue. If you check manufacturers instructions a flashing burner led states this. I'd give Grant Tech a call to confirm

Just a note. A line blockage is consistent with the symptoms you describe. Oil line fills when boiler off and runs perfectly well. Once the burner is running and using oil the supply becomes strangulated by any obstruction and then locks out. Oil line refills and the cycle begins again!

You will have to break the oil line which means that the oil pump will need bleeding once you reconnect. If you know how to do this then you can check the fire valve. Turn off the oil supply at the oil tank isolator (and turn off boiler). The fire valve should be outside the boiler on a...

Check the fire valve. Disconnect it and see if there's a blockage either in valve or where the fittings connect to oil line. I've had nuisance intermittent lockouts caused by sludge blocking the fire valve. When your oil/filters were checked was there a lot of sludge/muck in evidence? Did...

Cheers Jon Good to have you on the site: There's some old heads on there and good advice!

Jon You are affiliated so you can get access Let me know if you have any problems A

Jon You have only just posted your intro on the oil forum! We are about affiliate you so be patient and then you can access the manuals library There is s Cam 3 manual in there Andy

Cell or more likely control box

I wonder if the burner is in a state of permanent ventilation. OP - does the burner sound like the motor/fan is running but it's not teaching ignition/flame-on?

Have you trying ed hitting the burner reset button and/or the overheat reset button?

Good luck ....and have a good think about the Worcester fixed price repair.....

I assume you're "off-grid". Ask a neighbour for a recommended oily (doesnt have to be OFTEC as long as he's competent). Someone local to you will know someone. A word to the wise however. Don't give him chapter and verse about how you've been on a DIY site and you have diagnosed the problem. Be...

If prv is dripping then I would also check the charge if your expansion vessel. Just replacing the prv may not be dealing with the underlying cause of why the prv has lifted in the first place Have you got all the necessary test equipment to correctly commission the new oil pump?

The secondary heat exchanger baffles should be ok. It's the primary heat exchanger baffles which sit vertically in slots and are held in place by a retaining clip. Theoretically, when the clips are removed the baffles simply fall down into the base of the combustion chamber......

If it's the condensing range of Heatslaves then I pity the poor bloke who walks into "service" it. You cannot neglect these boilers due to the baffle arrangement and if your PRV is blowing then your water jacket may start to bow. This combined with a few years build up of sulphur is gonna make...

Barki If you tried hitting the thanks button when you receive advice then might find others more willing to try to help you. Good forum etiquette .. Just sayin

He was actually MD at HRM

Bob and Muggles you should have received an email confirming your membership of the forum Sorry if this is making the thread messy!