My Vortex bell box strobe has stopped working the box is 10 yrs old does it need a new internal battery or should I purchase a new unit ie bell box or strobe.
imo, i would be looking at a replacement, you can buy a better box for under £30.
You can test the battery by removing the mains and battery from the control panel, then the sounders hold-off should kick-in. Only do this if you have the codes to silence the system and engineer code if a tamper reset is required.
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