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I'd be looking at a dirty blast tube first, then I'd be moving on to oil supply and oil pump

What burner does it have? Does the burner sit on top of the boiler or at the bottom

Does sound like a photocell, but could also be a few other things. When was the last time it was serviced

When you press the restart what happens, motor start? Does the Boiler fire

All combi boiler works in the same way. They all give priority to hot water

Try changing pre heat to 0

He'll more than likely lose his first set or break them so better to get something cheaper until he starts to look after them.

1 min 45 is quite a short amount of time. I don't think your problem is that. Does the boiler stay alight when trying to reach 70

If this is your issue, lower the anti cycle mode in the service menu

It's warming the heat bank up. The t stands for tank.

Do you mean the 'exception' section of tb008?

Without seeing your system I can't really advise. Maybe a flush. Get a decent engineer to take a look

This sounds very much like a system problem rather than a boiler issue, this boiler modulates 1/10 and the pump modulates to match system demand

It does sound like the spark generator intermittently not sparking

Check that fuse in the middle for continuity

Does the burner lockout?

Mark 2 is out now and can take external controls now

When you switch hot water to 'on' on the timer, does the blue light come on the boiler and it fire up? isolate the power to the boiler and programmer, remove the programmer by loosening the two screws underneath and take a picture of the wiring and post it.

You'll need a dual channel, the hot water timer will be used to control the heat up of your slave tank which is used to heat your hot water. Oil boilers don't work like your usual gas combi boiler.

Looks like it's open flued. Probably goes up your old chimney? In that case it looks correct.