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Gowden, checked the voltage from pcb. The voltage from black - neutral to gas valve 234volts and neutral to white fluctuating low voltage. What do you think it could be then pcb or pilot solenoid

Boiler sparking everything calling for heat, no pilot gas on outlet of gas valve, pressure switch clicking, fan going, pump going, pilot electrode sparking ok. No holes in pressure switch pipes, Any ideas what the problem could be?? Your help much appreciated