Optima XM - Alarm won't arm.

[Jim47]

After returning from holiday and entering the house, the alarm was making an unusual noise but silenced as normal when I entered the code. However, later on before going out, when I tried to set the alarm nothing happened when I typed in the code. I then noticed that a light is lit up for zone 4 as can be seen in the photograph.
Any help much appreciated.

 

[sparkymarka]

The dustbin would be the first call....the rubber keymat is missing for a start ...how the hell do you put the code in ? Poke it with a key ? Try pressing reset for a start !

 

[The Pars]

You have a problem with the lounge or kitchen sensor.
If these are PIR,s firstly check if the led comes on/goes off when walking past. It looks like it could be the relay is stuck open.
As Sparky says though time to upgrade!

 

[Jim47]

Thanks Sparky for your brutally honest assessment and your suggestion to try "reset" - it worked.
Thanks Pars for your advice too. After resetting, zone 4 was no longer lit up and I was able to arm the alarm as per normal.