Possible sensor fault (Astec alarm)

McGrath5 · 12-08-2016 09:19PM #1

I have an Astec alarm with a possible faulty sensor.

The alarm will not set, either fully or partially.

I have attached a picture of the error, hopefully this helps.

Is a new sensor easily sourced? I know these alarms are not sold anymore.

KoolKid · 12-08-2016 09:33PM

Yes sensors and contacts can be added to these systems. You need a 680ohm resistor across any contacts. Disconnect and close off the sensors on that zone one by one untill the fault clears. That will be the unit you need to replace.

McGrath5 · 13-08-2016 08:25PM

KoolKid wrote: »

Yes sensors and contacts can be added to these systems. You need a 680ohm resistor across any contacts. Disconnect and close off the sensors on that zone one by one untill the fault clears. That will be the unit you need to replace.

Thanks for your reply, sorry but closing off the sensor, what exactly does this mean?

KoolKid · 13-08-2016 08:31PM

If you open a sensor you will see 3 connections. Remove the 2 outer cables & join together.
If there is a resistor in one of them connect one wire to each end of the resistor.

McGrath5 · 13-08-2016 08:37PM

KoolKid wrote: »

If you open a sensor you will see 3 connections. Remove the 2 outer cables & join together.
If there is a resistor in one of them connect one wire to each end of the resistor.

I'll give this a go, thanks for your help.

Possible sensor fault (Astec alarm)

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