ferroli 80e modena boiler problem

[olivernott]

Switching on bolier results in spark with flame for 5 seconds and then the spark stops. All lights on for heating and water and no red lights. Tried re-setting bolier and no fix. Had gas man in to check pressure, all ok. Did switch off the electricty for the house and back on again and all ok but some hours after the bolier started with these issues. Anybody had these issues?? Please help

[gasman]

Is the pump running ?