I currently have a Gardtec 500 alarm installed which is now at least 10 years old. This morning the alarm started sounding and when looking at the panel it displayed a letter E which in the manual advises a fault with the entry/exit zone. The panel was completely unresponsive to any codes entered so I proceeded to follow the factory reset procedure by disconnecting the mains supply and battery then removing the pcb from next to the anti tamper switch. Once powered back on the alarm was in the same state, letter E displayed on the display. The external siren eventually switched off by itself but the internal panel makes more of a loud buzzing noise then a siren noise. I have currently left the panel with the mains and battery disconnected as this is the only way to stop it making the loud buzzing noise. I assume the unit is completely dead ? I am going to try and remove the sensors for the Entry/Exit zones but I assume this isn't the true cause ?

Mark_84, January 2012

My alarm works perfect except when its not armed instead of showing Un it as a flickering 86 any ideas anyone?

mark, June 2013

So what was wrong with the panel then?
Please tell, your answer will help others.

acorn, January 2012

The batteries have recently been replaced. Turns out the panel needs replacing. Thanks for your input ....

Mark_84, January 2012

Just because it's rechargeable doesn't mean it will last for ever.

10yrs old, you should at least be starting your 3rd battery now, 5yrs max.

acorn, January 2012

You need a BATTERY

If you have the capability of finding here you must have looked for similar answers,,,,,,,,,,,,,maybe not.

10 years without a service = something dies. But you in your professional wisdom did a reset, and now are blaming the detectors.

Wish I knew as much about alarm systems as you do.

Alarm, January 2012

your fav question alarm guy

gts, January 2012