doubtful it's an actual physical switch, but probably a built-in relay that only allows the microwave's outlet to 'work' if the fireplace is OFF, since they probably share the same breaker in the main panel...
some folks like this, some don't... I would rather the fireplace be the appliance that doesn't 'work' while the microwave is ON, since that's normally a rather short timeframe... maybe you can find the relay, maybe near the fireplace, or behind the main breaker panel, and switch 'which' one is always powered(the microwave!).
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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