Rayburn 460K won't ignite

[WHPES]

I have the same model Rayburn here in my house. If you need me to look at anything on it, please feel free to ask

 

[Williams 16]

Thanks to everyone for all your advice. Got the Rayburn up and running over the weekend. Tested the pump delivery pressure which was all good at 5bar initial period with soft start on Boiler side and 10bar for cooker (no soft start). Checked the resistance across both ignition units at the electrodes and found no resistance on the boiler side. Removed the HT leads and re-checked across the ignition unit pins and found the same result. Fitted a new ignition unit to the boiler side which resolved the issue for the boiler. On the cooker side I found an issue with the photocell which I replaced and all working good now.

 

[SJB060685]

So ebi transformer had failed for boiler as I suspected but the photocell was at fault for cooker? If the cell detects false light or is faulty then the control box wont open coils and it goes to lockout.
You seem to have a good understanding but I'm curious do you have a flue gas analyser to set up correctly?

 

[Williams 16]

Correct, I agree that the flue gas test needs checking and possibly adjusting which will be done by friend this week who has a calibrated meter as I don't own one yet.