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Pete, Electronic Engineer
Category: Home Security Systems
Satisfied Customers: 15416
Experience:  Over 16 years of experience installing and repairing electronics.
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The old ADT system that came with the house keeps going off

Customer Question

The old ADT system that came with the house keeps going off every 20min. I unplugged the backup battery, but can't find the transformer anywhere. Are there any other ways to shut this thing down?
JA: What's the make/model of your device? How old is it?
Customer: ADT safe watch plus 1990
JA: How long has this been going on? What troubleshooting have you tried?
Customer: Well I type the code in after it goes off and then it goes to ready with a green light, but the trouble light is on as well on the keypad downstairs
JA: Anything else you want the security expert to know before I connect you?
Customer: I can't think of anything
Submitted: 11 days ago.
Category: Home Security Systems
Expert:  Pete replied 11 days ago.

Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.

Expert:  Pete replied 11 days ago.

You will need to turn off or disconnect the AC power supply from the alarm system.

There is likely another backup battery in the bell housing itself, so remove or disconnect that battery too.

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