Rangemaster lpg leisure classic 110 flame safety device reset?

We took delivery of a refurbished rangemaster leisure classic 110 lpg yesterday and while testing all functions noticed that if either oven was on the igniter constantly flashed but if they were both on this did not happen and they functioned normally.

I may have two independent faults now.

I noticed that a sensor had become dislodged in one oven so reseated on to its mounting. This oven now no longer flares up to enable cooking. Prior to me reseating the sensor it did flare up.bi have tried putting it back to its unseated position but the burner still does not flare up.

Is there some sort of manual reset on the flame safety device?

Regards,

Dave