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Flow switches generally just get stuck/blocked with scale and the diverter valve usually need's a new diaphragm if its that type or if its motorised valve a new actuator

Well if he can't replace the head show him the door.... :roll:

All the parts are available as spares :D

So if you go back to the boiler you should have two "lives" now going into the boiler wiring terminal one from the spur to power boiler/programmer and one switched to fire it up

as mat1e said good photo will help

Where does the switched live from the room stat go - if you follow/trace it back to the boiler terminal you can check it is actually signaling the boiler to fire - the fact that the stat's lit up like a xmas tree and there's power to the boiler doesn't mean that what its signaling (the stat) is...

Hi eaton, thanks for your reply - care to elaborate on that for the less well educated among us I presume you mean the air setting ?

It say's just that "burning oil" I looked that up and it's just another way of saying 28 sec so thats ok although that is no guarantee thats what ts in the tank I suppose. Would the thick black smoke start suddenly or would it gradually build up over time ?

don't no much about those boilers but that fault you describe is usually a flow switch or diverter valve problem depending on which you have..

lady says its got "burning oil"

"Check for any leak inside the boiler combustion chamber. Or blocked condensate" condensate can do - in the combustion chamber oil or water oil i presume ?

I'll get on that case straight away !

No that is a concern of mine I thought if I took some "good" oil with me and run it up on that for a while and see what happens, other than that I don't know how to check the oil quality - seems funny how its run 6 months then get a delivery last week then soot.

Hi dc, thank you for your advice on cleaning - any thoughts on cause ??oil pressure is ok

Hi all, got a problem as usual.. installed a firebird enviromax combi 6 months ago been running fine customer happy as larry - till today. Got black smoke coming from the boiler she say's oh dear say's me. I asked if she'd had a delivery recently yes last week. I checked the tank for the usual...

Hi - have bleed/checked all AAVs/Manual cocks - no air anywhere, checked that flow switch as I didn't install it when I turned it upside down the circulator pump turned off ! yay I thought but then the boiler wouldn't start at all - oh dear. I wasn't sure which way/orientation this switch is...

Hi oilhead, funny you should mention that part as my customer says that that part had been fitted 2 weeks prior to me being called, customer said he had an overheat problem and the previous engineers then fitted a new flow switch and diverter valve actuator and a new mesh filter, but this...

Hi - I already changed the PCB, the customer says that the pump's been running since installation (4 years) ? I disconnected all the stat plugs from the board out of curiosity and it still runs !

Thank you boilerman for your really helpful replys - one more question though is should the circulator pump run all day/night 24/7 ?

Hi Oilhead, that sounds like you might be bang on there - thank you I'll check next time I go back.. do you know what temp the store should be at by any chance ??