OK, I can see a do-hicky with a wire which sits in the flame this would be
the FFD, whatever that is... I was guessing at a thermostat type problem,
but can you explain how if it does, a FFD causes my problem.
The part you see that sits in the flame is could be either a thermocouple or
a FFD (flame failure device). Remove it and take it to a spares place for a
new one. A plumbers merchants may be able to get you one or direct you to
someone who can.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.