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.

Thanks again






"NM5K" wrote in message
...
On 12/21/2011 4:35 PM, Tuuk wrote:
Absolutely right.

I appreciate all the input, yes it would have cost me a lot and for what
turned out to simply be a resetting of that limit switch.

Good part is that I learned my furnace mechanically inside and out. Only
costs me about 100 and have a spare board now.

But after trying everything I could think of, after bypassing all the
safeties and bypassing things I was just perplexed.

Thanks again

73s

The only thing I wonder about is why it tripped the limit..
I'd keep an eye out on it for a while.. Make sure the fan
never quits running when it should be, doesn't start slowing
down from normal speed, filter clean, etc..
Of course, if there is some problem, it will just trip again,
and you might be able to get an idea what is causing it.

I've already listed most of the things that could cause that.
In the majority of cases, it's the blower motor going kaput.
Then again, maybe it was just a fluke.. @#$% happens sometimes..

I said before that I didn't want you to burn your house down,
but actually it's almost impossible with all the safety devices
those things have. So you really don't have much to worry about
if something does cause it to overheat in the future.