Called to a friend's house this morning boiler not working. Filter on tank gauge blocked cleaned and cleaned in line oil filter. Tried to fire boiler, lockout. Checked oil pressure fluctuating slightly but around 150psi. Removed burner spark OK. no oil, replaced nozzle still no oil. I am a gas engineer with limited knowledge of oil. Not familiar with this burner is it the oil solenoid Merry Xmas All