Over recent years our alarm has sounded whenever mains power is restored after a powercut. Although a bit of a pain in the night, this never caused a serious problem until the last time it happened, when the tamper light stayed on and the system would not reset. The battery fuse had blown on this occasion, and I've replaced this, and tested the 12V battery, which seems to be fine. Disconnecting and then reconnecting the mains and battery power sets the alarm off, as per the powercut, but then no change to the tamper status/keypad lockout. The PCB looks fine and none of the wiring through the house has been disturbed recently. Bridging the tamper loop (terminals 15 &16) makes no difference to any of this.

I'm grateful for any helpful advice how to restore normal alarm function.

Simon, March 2007

Thank you for your suggestion.

In fact once I had removed the bird's nest from the top of the external sounder box (some of the material had fallen inside and must have been causing a short-circuit) the keypad would reset fine !

Simon, April 2007

hi try changing the battery in the bell box and in the control panel it will be one or the other this worked on mine had the same problem as you. as for the lock out put your alarm in test mode and take off your cover on the control panel and remove all the wires out of there terminals make a note where you took them from and try not to touch the wires with any others you take out then replace them one by one this will take your alarm out of lock mode good look

blackie 147, April 2007