I got a new house, it came with an alarm, it went off randomly, the code is unknown and it won’t stop!

38 comments
  1. Just an FYI: the code is unknown, the previous house owners never used the alarm so they don’t know the code either. Originally the alarm was beeping really loudly, but I turned off the mains in the circuit box and turned it back on, and the beeping stopped but the lights on both the alarm box (pic 1) and the light outside my house door (pic 3) are still on.

    It starts beeping loudly again if the trip switch is turned off now (it has its own battery inside the box in pic 2). So for peace it’s turned on but idk how to turn off the alarm (including the lights etc)

    Any code I try it says “Access Denied” on the alarm box.

    Anyone know how I can permanently disable this thing (in the cheapest way possible?)

  2. The alarm should stop after 20mins, think that’s the law, but not always the case, when I first moved into my house a year ago I had the same alarm system, went off randomly one night when I was in work, was going for about 3 hours, neighbours went mad, anyway, got rid of it quick and got a monitored alarm in.

    Also, not a single neighbour called the guards, they all just assumed the alarm was bogey

  3. Most alarms companies can reset it, but they will be reluctant to take on an old system since it could fail in so many ways and they wouldn’t want liability.

    Open the main panel and see if you can figure out the model, but beware it has mains voltage. Perhaps a HKC CS350.

  4. This exact thing happened to us a few months ago in our new place! We are not handy at all and this happened late in the evening… Ended up locating the panel box where the wires and power for the alarm was – and disconnected the power, that stopped the alarm. Its a shite old alarm system that we were going to remove anyway. Hope ya get sorted.

  5. The other box on the wall with the battery incase of power outages should have the name of the company who installed it

  6. Its easy. There should be a fused spur. Remove the fuse.
    Then remove the wires in the box in pic 2 from the battery.

    Now the system has no mains or battery backup power it will stop making a noise.

    Next phone your local alarm company. They will be able to put new codes so you can use the alarm and also trace any sensors that are faulty and causing false alarms.

  7. Had a similar system and no code. I managed to contact the guy who originally programmed the systems. He was able to root through the assembly language of the motherboard but couldn’t clearly identify the password. Next step was to replace the motherboard with a spare he had. Unfortunately replacing the motherboard is a fairly messy task as there’s a lot of rewiring involved. We found the only way to get enough access was to remove the (very large) backup battery. At which point a piece of paper floated to the ground …… on which the password was written.

    TLDR: look under the battery.

  8. There should be a couple of fuses in the box for the battery and power, pull them. Then disconnect the battery. Be careful of any thing live. If you want to be extra careful, disconnect mains first.

    Disclosure: happened to me recently when battery became faulty.

  9. Thank you for posting this OP!

    We bought a house recently with an alarm and didn’t have the code. Several times we asked the estate agent to get us the code. With “ya, ya that’s no bother”… The sale went through and I’d given up.

    After seeing your post I tried again and texted the estate agent. He forwarded me a message within a couple of minutes from the seller that he must have gotten some time ago with the alarm code that included well wishes to us as the new owners and to forward and questions to him.

    OP I hope that you get sorted with your issues.

  10. There is a master reset code for these, it will be in the installation manual, just Google the make and you’ll find it.. the code will either be punched into the key pad, or it will be a jumper/dip switch combination in the control box.

  11. From your photo keys 2, 3,4,5,6 and lesser so the 7 key all visually have the most wear visible on them.
    So try 23456, or 65432?

    Keys 0 and 1 and sonewhat so key no.9 seem to have no wear at all

  12. I’ve worked in several places with these exact alarm panels and the codes were always a year. I’m not saying it will be, but worth a shot…

  13. firstly,

    try 1916 or 1478.

    these are the most popular codes in ireland.

    if no joy – temporarily decommission it / power it down –

    ​

    find control panel (thats a keypad in the photo) (often up near fuse board, attic, utility room and hotpress) its about the footprint of an A4 page and a weird beige metal

    its where the PCB and back up battery are and where all the cable sare terminated.

    open it up, disconnect the back up battery

    also pull the fuse from the spur (little socketsized box feeding power into the control panel – often has a red led indicating mains power)

    put the control panel cover back on

    ​

    the external bell will ring a further 15mins and then IT SHOULD cut out.

    ​

    done. and left in a way it can be defaulted / reprogrammed

    ​

    ​

    i used to install these for a living

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