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The pressure relief valve is leaking.

With your set up, a vacuum pump attached to the oil feed into the tiger loop would be most useful. They are reasonably priced here and consist of a 2 litre vessel to which a hose is connected to the pipe, and the vessel is then evacuated by a manual pump. Depending on the length and rise of your...

Many modern programmers will switch off the power when programmed to off.

'Adjusting the pressure' without knowing what to and balancing off the air supply is a recipe for a soot disaster.

Your old thermostat would have ranged between approx 50c to 80c. Decide what flow temp you want in your radiators and set your new unit to that. The old stat was a relatively coarse unit and would have cycled the boiler over a range of approx 10-15c, I can't see any specification for the ST3008...

Could the click be a pressure release valve operating? How is the pressure gauge reading? Is there any discharge from the valve?

If you buy a complete new gauge, I think you'll find that you can leave the tank fitting in the tank, with the tap turned off and the new valve fits onto it solving the pull to read problem and the gauge question. If you still want to use the old valve and just use a new filter then the best...

A yellow flame around the base suggests air supply problems .

Follow the wiring diagram in the manufacturers instructions. You may have a post purge unit fitted to your burner, Worcesters often did, which slightly alters the position of connections, although IIRC, it does not affect the transformer. There is another diagram on the base of the control box...

Glad to hear the finish. When any of us offer advice about regular servicing we are often shouted down, but this proves the case. Although you say everything is clean, this is not necessarily a good thing . It can be a symptom of lean mixture, which could explain your original problem when...

That is the telephone response to the tooth sucking intake of breath that you would have got face to face.

There is always that possibility, and persistent attempts at reset will not have helped it. My first suspicion would be the solenoid coil as the box looks for circuits in the startup period, and if there is a problem there, this is how it could show up.

The transformer is connected to terminal 3 of the wiring base. From you picture, something has scorched the earth wire which needs investigating. The transformer can be tested by taking the live connection direct to the mains feed. Switch off all power to the boiler, connect the transformer...

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...