Experience with vokera lineal boilers

[Matt0029]

Anyone had much experience with Vokera lineal boilers? I had a call about one that's turning off every 30 seconds then re-lighting for 30 and carrying on in this sequence no fault lights present on the boiler. Is this likely gas valve releated?

 

[ShaunCorbs]

not sensing its fired prob or over heat

 

[Darren Jackson]

Common for the venturi to become blocked on this model, It starts ok on initial fire up then APS falls to off and it repeats again and again, I doubt it is the gas valve. also check the resistance on the thermistors. could well be sensing a false overheating scenario. Or it is overheating and the hex needs some attention or weak pump.