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Neither did I think you would have told me how much you would charge to come out on a Sunday to do such a simple job :)

Boilerman2 Maths done :) It is my house :D If it was winter I would have gone 4 miles to our workshop on Sunday. I knew someone would be coming here on Monday, he brought some old kit we had, being peasants we never throw anything away. Tried changing coil and PE cell to no effect. Try...

New control box arrived this a.m. Photocell is in post :)

Boilerman2 I'm sure with your greater experience you're probably right. Are you saying that the fault can never be in the control box? :? It's been working for a day now with the old Photocell and a replacement control box.

ringy1 The 5bar pressure is required to open the Air damper hydraulic jack that opens the shutter that admits air to the fan. The fan should run for 12sec. before the burner ignites. At this stage the electodes discharge and oil is released by the solenoid valve at 12bar. If the oil fails...

Glasgowgas I guess you owe me :D Neither coil, nor photocell. Fault in control box, bit of luck we had an old one that works :) Where's the best supplier for a 530SE control box part No.3001156? Thank you for your kind thoughts boilerman2. While it's true that the commonest things...

Yes That's what I suspected. Will check tomorrow, I think we may have the bits off an old burner. Surprised that lock out didn't work, don't remember that happening before.

Would I be getting 5bar if the coupling was broken? :?:

Thanks for your interest :) Much the same as Tamasheen's was. Just mulling round what it can be for our Riello40. Only difference is that it does not fire up. The fan runs, 5bar on pressure gauge, does not go to lockout, so fan never stops & burner never fires up. I presume either...

Is this the typical unhelpful response from a "competent engineer" or don't you know the probable cause of the problem. Either way, it does not help me as I have the same problem (without the swimming pool :cry: )