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Problem solved! :D It was the coupling. It's only seeing the new one that illustrates just how much wear the previous coupling had. So I now have pressure (at last!) - just have to commission the boiler now. Many thanks for your help - it's made a great difference to have someone to...

Yes - it turns easily and a little oil comes out of the bleed point/pressure monitoring port. If I replace the bleed screw though and continue turning the spindle nothing comes out of the outlet that runs to the burner nozlel - shouldn't oil exit from there as well?

Yes - it's blowing air and I also ran it with the pump off to ensure that the spindle is turning - all looks good. Currently checking out the pump in detail. With the pump connected to the oil line and the back off fuel pours in so no obstruction there. Looking at the construction I reckon...

Although I have to say - having just checked the old coupling it sits firm on the oil pump shaft and firm on the motor. It worries me that there might be an air lock somewhere or that the pump has not been fully bled - although I don't see what else I can do to bleed it.

I've continued experimenting whilst I await the delivery - and there's a revised observation. If I remove the pressure monitoring plug from the oil pump (which doubles as the bleed point) it drips. If I turn on the boiler there is an initial spurt of oil but then that stops. I know the...

Thanks spraggo. Fitted the new controller and listened for the solenoid with a screwdriver and there was an audible click so I'm discounting the solenoid which implies that the pump is providing negligible pressure. Still waiting delivery of the replacement pump/motor coupling so fingers...

And an additional but related question . . . the old controller is a Satronic TF830B which I'm told has been superseded by the TF830.3 which is what has been ordered. Will the old photocell (for detecting the flame) be compatible and if not any idea which one should be obtained for it...

Yep - double double checked and the pumps are identical - both BFP11L3

Difficult to tell if the click is from the control box relay or from the solenoid. New control box should arrive tommorrow and likewise a new oil pump to electric motor coupling. I'll post the results. Meanwhile if anyone thinks of any additional diagnostics please flag them up. Thanks

So based on that it could be a solenoid related issue? As I see it, we have oil to the pump and in operation oil shoots out of the pump bleed point (which doubles as the pump pressure measuring point) which implies that the pump is pressurising. There is no oil pressure at the burner (I...

Re solenoid - just done an experiment - I disconnected power to the solanoid and ran the previous test (bleed screw out and boiler turned on) and oil still shot out of the bleed screw which makes me think that the solenoid must be on the pressure side of the pump.

So just to clarify - the integral solenoid stops the flow to the non-pressured side of the pump rather than to the pressured side (ie it does not interrupt the flow between the pressured side and the outlet to the burner)?

Also - following your exact instructions (which I miss-read first time around) - with the bleed screw removed when the pump is turned on, the heating oil shoots out. So I'm wondering if the solenoid is being activated. Any suggestions on how to check that it is being activated?

Hi spraggo, The flow of oil to the pump is good - I removed the inlet hose and it shoots out. The recommended bleed point for the pump is the pump pressure test point so the exit hole is small. I uncrewed the plug totally as suggested and the oil drips out slowly which presumerbly is...

OK - I've checked the new pump - it comes as default set to single pipe operation (which is what I want) - conversion to 2 pipe operation requires the removal of a washer - and the washer is in place.

Correction - I've just been following up on the one pipe/two pipe operation and have looked at the pump documentation - quite correct - the setting can be changed - I'll take it off and investigate. . .

Hi Agile - interesting point. The electric motor is certainly turning and I reckon the coupling was in a good enough state to turn the pump - although I guess there could always be slippage. Any thoughts on how to check that it's turning? Hi spraggo - I don't think there is a setting - I'd...

Hi, I'm fault finding my Heatslave 25 combi oil boiler. The problem announced itself by going into lockout and there's no oil pressure showing at the burner head (I fitted an oil pressure meter). The burner is a Electro Oil B11. So far I've. . 1. Checked the oil supply to the oil...