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looks like a boulter camray wall hung outdoor. you may find the 'target brick' is obsolete

am i invisible here? as also said by oilhead, close the air damper somewhat...

who changed the thermocouple?

what was the co2% in the flue gas? sounds as if its burning to lean. 300 is too hot. Take a note of the air damper setting, then close it slightly. a little bit at a time, to see if that improves ignition. or use your fga to check co2 is 12%...

Primary store stat changed? Hidden behind panel, try adjusting it down slightly with a small screw driver. It'll be painted in a fixed position. expansion vessel fexi hose blocked?

Not long completed a similar job although boiler was moved into loft, so more like 30odd meters of extra copper. Decent boiler fitted though and lpg. 2.5 days. Wireless programmer retained. Job done to current standards. little guy = 2400

You need a new burner motor, if you can use a multimeter safely, check for 50v from white wire on motor when its running..

everything

true, one should not assume the obvious has been checked lol

Switch off all electrical supplys...remove burner to check weather the blast tube at the 'business end' of burner is dry and not wet with fuel...disconect photocell from under the controlbox, (thing with orange re-set light, held on by a single screw). photocell wires will be the two lower ones...

I have an old unit here, if you want it for postage costs? dont know if works though