the boiler has been playing up a bit today. When the room stat is calling
for heat then everything is fine, the boiler goes on and off as normal. If
the rooms are warm enough and the CH is just keeping the HW hot, is seems to
be struggling to light. As the boiler is about to light up, the gas valve
will click a few times, sometimes light and quickly go out, then finally get
going. It also only seems to do this when the boiler is on the LOW setting,
switching to HIGH seems to stop the problem.
I am guessing this might be the LOW temp stat inside the boiler on its way
out? Does that sound about right?