On 12/21/2011 6:07 PM, Tuuk wrote:
Hey, Thanks for the good advice.

I recently installed a sauna and spa on the same floor, it just happened
to be that particular evening that the limit switch tripped when I had
used those two units so I think I got a lot of humidity and heat in that
basement. Then I also had to remove the intake pipe supplying the fresh
air from outside because I had to move something else so that pipe was
off and it was sucking in air from that room for combustion. Also, the
heat supply ducting inspection plate had been removed from that room
because I wanted to add some heat into that room. When I feel that
intake area near the tripped limit switch, it is very warm. Now that I
have re-connected everything it is cold. So maybe those scinarios had
direct responsibility for tripping that limit switch. That is what I am
thinking. I think too much heat in that chamber caused it to trip. Doing
its job. Hasn't tripped yet after about 6 hours of operation on and off.

That was probably the problem. Shouldn't have been a severe overheat,
but maybe enough to push it slightly over the edge as far as the limit.
I doubt you will have any more problems if it's run OK so far.