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Trouble Light Code 2 On My NAPCO Gem-P800?

I have a NAPCO Gem-P800 security system that just started showing a trouble light and a Code #2. Based on the manual I replaced the control panel battery (the battery is 8 years old) but the problem returns. How can I fix it???

Bill Ferguson
July 2009
NAPCONAPCO Gem-P800Security Systems, Home Alarm SystemsLight System Showing

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NAPCO Gem-P800 Code 2 Trouble Light - Fix