Maybe Bob has shares in the photocell supply industry!!!!
Heres a few other possibilities.
1. Oil supply.
2. Motor
3. Pump
4. Control Box
5. Dog Drive
6. Solenoid
7. Blocked nozzle
8. Air supply
9. Electrodes
10. Combustion chamber problem (full of soot)
11. Good old photocell
Do yourself a favour, get an engineer in
jimtheboilerman
May 2012
Check the photocell is clean, or replace it as a matter of course
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix oil filled radiators.