potterton mf

[dom]

it sparks but does not light sometime it lights after a time other times the customer turns it on and off on the switch and entually it lights this only happends when iam not in
attenance . when iam there it lights fine any idea's
dom

 

[fireblade]

At a guess Iwould check the pilot jet tomake sure the pilot is big enough an check and clean the ionisation probe otherwise dodgy air pressure switch

 

[Puddle]

Gas valve sticking,replace soon or will damage main pcb