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Is it an ADE optima?
They were known for burning the resistor if the battery wasn't changed.
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The alarm is a C&K Securitech 700L
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Just replace the keypad, wire for wire.
No need to reprogram or default.
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Omnicrons always play up when the batteries have gone.
When was it changed last.
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Omnicrons always default back to the factory code if the power has been removed
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