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A 28mm valve is far more likely to be used on a heating zone than a gravity one nowadays.

No Need to pipe to boiler. It will be fine into return after last rad.

If you do not have a multi meter, you could wire a fly lead direct to burner to test. If you have tried the motor and control box the fault is on the controls. The easy solution is a voltmeter as pointed out already.

28mm valves have 6 wire head as standard.

90% of plumbers will not have a clue. It is however an easy task. Trace the route of the capillary and remove the two top screws securing the side panel, and lean it to the side Isolate the electric supply and remove spade terminals on stat. Remove any split pin or plastic bush retainer and...

No picture.

$hite fuel again. Anthracite should be black and shiny. I have seen these boilers slumber for 3 days with no heating demand. In the 1980,s , In an effort to save money " Coalflow Pearls" were introduced by the NCB for the Miners fuel allowance. Despite fitting additional stats and a kindling...

That is unusual are you sure But if that is how it is piped you will have no problem fitting a stat.

If you can switch the boiler only on to get hot water and both on for heating there should be no problem.

He is hardly an engineer if he cannot use a multimeter Check the flow switch is not sticking !

Move the phial to a cooler position and see what happens. Temporally !!!

What do you think oil pumps and tanks are made from.

If you have a remote acting valve fitted already. Just swap it for a 1/4" lever valve as its only purpose will be for maintenance purposses.

Fit a AECV

Yes with a firm grip on shaft,

Pump should turn easily by finger pressure.

fit a new nozzle. as for algae... I have never seen any in 40 + years on the tools.

Are all your flue ways clear on boiler.

It will be the coil.