Lennox furnace--is this a safety switch or a circuit breaker?


My wife changed the filter on our gas furnace yesterday, and now it doesn't work. I pulled off the front cover and on the upper right is a small black pressure switch of sorts. I originally thought it was supposed to be held shut by the cover, but that is not the case, as they don't match up.

furnace/blower. When I push the protruding switch back in by hand, the furnace fires up. It is spring loaded and won't stay in place, however.
1. It seems accessible--can I swap this out myself?
2. What did my we do to break it?
3. Would the local hardware store carry something like this?
The switch/circuit breaker says 10a/250vac on the side.
It is a Lennox Pulse furnace and I have the paperwork for it, and our recently purchased home is circa 1968. We have been using the groovy 1970s wood stove since yesterday, and it is about 25 degrees here in frigid Utah.
Someone suggested I had the filter cover on wrong, and that it should be depressing this switch, but from the way it lines up there is no point of contact, leading me to believe this is a blown circuit breaker of some sort.
Ok, off to buy more firewood, thanks all for any suggestions. We have an HVAC guy who can look at it later today when he's back from skiing/snowmobiling, I just wanted to try and fix anything painfully obvious and embarassing before then.
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It's the blower door saftey switch (required by law) so the furnace will not operate unless the door in put back on properly. Press the door to the furnace start with the door about 6" above the opening and keep presure applied towards the furnace while sliding the door down. When the door is in place properly the switch should be made.
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Thank you, that did the trick!
jolt wrote:

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Glad to help.
YFI while of little importance on your Pulse furnace because of it's unique design, the door safety switch has protected peoples health and quite literally saved life's.
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