OT: RV furnace help needed

During Christmas, my wife and I moved into our toyhauler so all our
guests could have their own rooms...the night time temps got down near
30°F or so, and the second night the furnace refused to light. It
would go through the usual cycle--

*blower on
*about 30 seconds later, the ignitor would start clicking then stop
*about 15 seconds later, ignitor action again, then stop
*about 15 seconds later, ignitor action again, then stop
*red LED starts flashing on controller board indicating ignition fault
*about 20 seconds later, blower off

Turn thermostat switch off, back on, repeat above, etc.

The next day I went out to figure out the problem, except that it
fired up on first try. Dang.

That night it wouldn't fire up when it got cold again.

I got out my garage heat gun (wife's old blow dryer) and heated up the
furnace, and sure enough, it fired up on first try after warming up
the sensors and controller.

Any idea what the problem is?

It could be a bad sensor, a bad controller, or maybe these things are
just designed with such a high setting for sensing the ignitor is on
they simply won't function right in temps below 40°F?

Anyone have trouble with their RV furnace in cold temps?

--
Charles
'99 YZ250
.

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