Electronic Alarms and Home Security Devices - Ademco Alarm with "OC" in Keypad display

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ranzie
10-19-09, 12:42 PM
I have an Ademco alarm . The display on the keypad reads OC. It was working fine for 10+ years and one day went OC. I called the alarm guy who said I need a totally new system for much $. I think that it is a bit of a scam and could be repaired.
The key pads are N59/6v1 and the system is a VS20 or vista 20 or N7525v3. I'm not sure which. It appears after several months that the battery has died too. I will replace it if there is a chance the system can be fixed...by me or an electrician.

MrRonFL
10-19-09, 06:22 PM
OC means that communication between the keypad and the motherboard isn't working. To give you much more, we need to know wat _model_ your system is.

Simple test: connect the keypad directly to the terminals on the motherboard. This will determine if it's a wiring problem, or a hardware problem.
MasterGreg1975
10-28-09, 05:55 PM
The bad battery is the source of your problem. It happens on older vista 20 panels & shows OC. Reason being, the bad battery draws too much power & causes all other devices to stop working because of the power deficiency. Replace the battery. Power it down by disconnecting the transformer & then power it up. Connect the battery after powering it up.