Hi,

I have a trusty 2 year old Micron 30FF that is causing me some grief.
It successfully lights on every firing sequence (I have the front off
and can see the blue glow of the flames) but at the end of the sequence
the gas is cut and obviously it doesn't stay lit!

I had a professional come and have a look (a friend) who squeezed one
of the pipes to the air switch for 40 seconds during the lighting
sequence - causing the fan to turn for much longer, and this caused it
to light once he'd let go. He said replace the air switch.

I've done this to no avail - same problem. It nearly always fires if
the fan is turning for 40 seconds before the rest of the lighting
sequence carries on.

The fault is one that says "software error" in the manual - great info.
Micron say dodgy earth or PCB. But why does it light when the fan is
forced to turn for longer?

Once warm it always lights on demand. Should I replace the thermistor
/ give up and get a new PCB?

Many thanks

Dave