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Possible faulty solenoid coil or maybe capacitor. Is there a hum from the motor when first switched on?

Do you not have an isolator tap fitted to the feeds?

.......And check for visual smoke before putting the probe in. Any idea which make and model of burner is fitted. With that pump, my guess would be a Sterling, which has rubber drive dog between motor and pump. The nylon drive dogs wear on that burner and cause noises like you describe.

Before messing with screws, measure the flow rates. The data plate on your Aga will give the correct values for your cooker. I always remove the carbon leg and loosen the flow elbow so that it can be rotated out of the door, refix the carbon leg and switch on the fuel, allowing it to drip into...

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.