Not sure abt the Miramar/Challenger, but on my Vegas you need to remove the outside cover.
Then once inside the furnace cavity, you will see a switch or button
Let us know what you find
BTW...if you do a search on this website or even Google, you are likely to find photos, diagrams and videos of your particular furnace.
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'17 Vegas 24.1
Fallbrook, CA
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