Hi, Really excellent info. on this thread - many thanks. Thread is several years old but helpful for me despite it's agedness, and may help others with older ex-ADT systems featuring the Accord XPC. Hence,
Administrator, please keep this thread open, it was a God's send to me!
I just want to add a few observations on this issue described above. That is, replacing an ex ADT installed Accord XPC battery.
Background: After 9 carefree years, following the cancellation of my ADT subscription, the internal alarm, positioned near the key pad in my hallway, sounded late one evening although the the alarm was unset. Not the usual power cut alarm, but much more intrusive and noisy sound. The battery icon was also flashing (no mains power-cut issues at the time) on the keypad. The user code was subsequently entered and all was well - until later at 2:00 am, when the alarm sounded again! User code again entered, and this temporarily halted the alarm, but just for another 2 hours. On each occasion it was the internal alarm that sounded (i.e not the externally mounted wall alarm and 'strobe') accompanied by a flashing battery icon with a cross through it on the keypad. After the latter episode at 4:30 am (arrrgh!) I started an online internet search which brought me to this really helpful page.
Actions subsequently taken (5:00 am!) were: removed (pulled out) main power fuse from the the holder (alarm sounded and user code entered again to cease); removed the two bottom screws from panel covering the main CU box, in the garage, and lifted off the front panel (external alarm sounded as tamper switch triggered); and then I quickly removed the back-up battery leads - resulting in all being quiet and keypad unlit. That is, whole system switched off.
This other webpage was helpful
https://www.manualslib.com/manual/1409164/Adt-Accord-Xpc.html?page=22#manual for a free download of installation manual (I don't have ADT's Master code or Engineer code) and as yet haven't needed to use these but this manual shows option for resetting to factory defaults of master code 1234 and the engineer code 9090, if needed in the future.
Replacement battery was...
Power Sonic PS-1270 F1 12V 7AH Battery - Diamec DMUF12-7.6 Battery
ordered at lunch time from ebay (starterbatteries) - £23.00 plus free delivery - and delivered 10:00 am the next day. Excellent service.
Ok, here are some additional observations from the steps indicated in the postings above for reinstalling the back-up battery.
1. Hooking up the new battery sounded the internal alarm, which was stopped by entering user code (yes, the system hadn't 'self-defaulted' to factory setting which I had wondered about).
2. CU box front panel reattached
3. Mains fused pushed back into the fuse box.
All seemed well, but...the keypad had a bell icon flashing (in the top left of the display) in addition to the day circle. Also, while I could enter 'easy-set' and/or user code plus press the full-set button, the exit countdown continued, that is didn't stop after the usual 20 secs before the alarm was set. In fact the alarm didn't set at all so obviously none of the PIRs or the front door contact functioned. The user code stopped the endless count down bleeps.
The Manual suggested that the 'bell icon' was the tamper switch, inside the CU panel.
So... I removed the main fuse again (alarm sounded - user code quietened it); CU panel unscrewed again and lifted off (no alarm this time!!!). After some head scratching, I eventually realized that the tamper switch (this is a spring loaded, plastic 'stalk'-like protrusion, in the center of the panel) had not engaged properly with the small circle moulding, on the underside of the CU front panel.
I pushed the tamper switch in towards the circuit board and then tried to engage the end of the plastic extension into the circular area on the front panel. Very fiddly. Obviously however I was successful, as once the panel was screwed back in place, and the main fuse was re-engaged so that the power was back on, the keypad was also back to normal (i.e no bell icon flashing- just the day circle showing).
With fingers crossed, I then reset the alarm (using easy set) and all worked well. That is, a 20 second count down exit period, before the alarm was set. Opening the front door also gave me a 20 second 'window' to unset the alarm with the user code. So far, all seems well and no costly need for an electrician, plus a glowing sense of achievement
- we all need these small victories in our lives!
Once again, massive thanks to this forum and particularly to this thread.
