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Picture of the last girl you can see the shape of the implant.

Best one is the leggy black girl 'taken from behind'

That's her hair. I told you looking at threads like this would make you go blind.

I think it's what he's doing while he's looking at the thread, that will make him go blind!                                                                                   

Had the plumber coming to service my boiler earlier, but he didn't turn up. 

When I phoned him he said he couldn't come as he was doing another job and wouldn't be able to come round before Christmas. 

I'm not having much luck with tradies at the mo.   

Waited in for service engineer for my warm air central heating unit. Arrived at 1 ish, took it to bits, shoved a smoke bomb up, then condemned it. Bugger.    Leaking out into the loft at the flue angled joint with the ridge tile vent. Waiting to hear if they can source the correct flue part. It can stay mild for as long as it likes. 

That'll be alright. Just don't go up in the loft when the heatings on.     

Is it one of these? https://elektrotanya.com/blaupunkt_san_diego_dj31_sch.pdf/download.html

If it is you can download the circuit diagrams from the link on that page.

It looks like the processor on the faceplate (Page 24) is only used to interface the various front panel keys. Communication with the main board is over an SPI (Serial Peripheral Interface) using 4 pins - MISO, MOSI, SCK and CE. However the on/off function has it's own pin - Pin 8.

It looks like on the main board pin 8 comes in on page 19, but goes straight off again to the power supply page. I think that's page 8, and comes in on the bottom left corner. Couple of transistors there (V2054 and V2051), and what looks like a thermistor (R2051). That's where I'd start poking about.

Thats just wrong ! 

I'm surprised that all you F1 fans missed the passing of Michael Turner ,the illustrator .
https://historiccarart.net/collections/michael-turner

I grew up with his illustrations in Autocar, Motor etc. and was always awestruck at the way he could capture the moment .
RIP.

so if my understanding of your description is correct .the front facia button sends a signal to a microprosessor then this sends a signal to the main board regulator to turn on .
so i have confirmed standby power is present at the facia socket (5v) and im pretty sure this uP is in thd defacheable facia panel .so i know 100% this uP is ok .when the unit next fails to turn on il  heck that standby power is there and if it isnt thats the best fix .if it is then i know its something internal .it could fault tommorow or next month ! .

Picture of the last girl you can see the shape of the implant.

Best one is the leggy black girl 'taken from behind'

That's her hair. I told you looking at threads like this would make you go blind.

Who on here as any experience of these?

Looks like our old oil boiler from 1999 is pretty shot, so not worth throwing good money after bad in order to get it to limp on for another couple of years.

We have a plentiful supply of wood, so commercial wood pellets for the biomass boiler would not be required. This would help with running costs.

Also, I believe there is a £5000 government grant available.

Unless the heat exchanger and baffles are completely shot, it's always possible to keep them going for affordable money. All the bits to fix the burner are generally pretty cheap.

I think I have eliminated most of the possible culprits....

There is plenty of oil getting to the pump and nozzle, but no spark.

Photocell seems to function as it should.

This leaves the control box and ignition transformer.

My money's on the transformer or possibly shorted electrodes. Should be able to check the transformer windings with an ohm meter, although that might not catch all failure modes.

Picture of the last girl you can see the shape of the implant.

Best one is the leggy black girl 'taken from behind'

It could be leaking from the connection on the coolant pipe next to it where it meets the rubber hose.