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Part number 3007178. This O ring fits on the part of the flange that holds the blast tube in.

You'll improve the burner tp flange seal with a new rubber O ring if it is still there, or hasn't been changed in 20 years.

The burner flange is neither the inlet or the outlet. It is the gasket between the boiler body and the flange to which the burner is fastened. On a boiler this old, it is quite possible you may need a new gasket and some high temp silicone to effect a good seal. You also need to ensure the...

I can't tell from your previous posts whether you have tried anothe photocell apart from the one fitted 3 years ago, that would be my 1st port of call. A failed coil would not cause permanent prepurge which is what you are getting. . Regarding the cut out when the burner cover is replaced, have...

Check the joint between the burner motor and the oil pump. It is possible the shaft seal is leaking especially if you only notice it whilst running.

60oC at 1/3rd the way up the cylinder can result in much higher temperatures at the top take off from the cylinder. Any cylinder stat will be compatible but they are all quite coarse in there settings.

My thought is that the heat store stat and the boiler stat are out of sync, or there is an obstruction in the diverter valve that stops the boiler dispersing its heat. There used to be a similar problem with larger Mistral combis and they produced a mod that consisted of a clamp on button stat...

The black box sounds like a burner control box which has no effect on the boiler programming. There is not really anything you can do witout a multimeter and an understanding of the boiler circuitry. It could be a diverter valve head, or the P.C.B. or the programmer. does this boiler use the...

Is this a combi or a standard boiler?

Do you get a humming noise when pressing reset? If so, then it may be a failed capacitor. It may also be a seized fuel pump. Do you know whether you have a tiger loop fitted, or a one or 2 pipe fuel system? £1350 may be a little heavy, but all parts are still available for B11 burners.

DHW thermostat? Microswitch in actuator head?

you say this is balanced flue, but is it actually a fanned flue that has a pressure switch in the flue. This is wired into the control box and can cause the problem you have. If you consult the wiring diagram for your particular cooker you will be able to identify any overheat stat and check its...

If you fully read the installation instructions for these valves, it warns you about this. The screws are significantly thinner than the mounting holes to allow for float.

Try opening and closing it a few times. You may also be able to tighten the spindle up with the hexagon screw at the back.

as both Terry and I have both said, if the problem is with the post purge unit, then changing the burner will not saolve the fan running on problem. You need to feed the motor live feed direct from terminal 4, and disconnect the ppu conections and make them safe.

which is what I said, but gave a bit more detail to the OP who would have had difficulty with the short version above.

whilst not disagreeing with all the above, you have little to lose by cleaning off the joint and trying the selfamalgating tape if you can't/don't have soldering equipment. If you do, it is essential to ensure a good stretch, generally twice the length. and lay and well past both ends of the...

The difficulty with the Worcester unit is that all the connections are multi plug, and without the unit to look at physically, I can't be sure how to overide it. Basically the burner motor is driven from terminal 4 in the base, but this goes into the PPU and drives the motor from the yellow...

Yes, you have a post purge unit. The motor feed from the control box (pink wire) feeds this unit. This unit then puts a feed back to the motor to run the burner, and this unit also keeps the burner motor running for a period after extinguising. This is what has failed, but at £120 + vat, I would...

sorry, should have said if the burner motor runs on after the burner extinguishes. Do you have a wiring diagram for your boiler/burner? Is there a post purge timer/pcb?