A Protection Loop Short indicates that you might have some faulty wiring for a particular zone or a faulty alarm panel. This wiring or alarm panel fault requires a technician to attend and check the system. If the signal persists, please call during business hours to arrange a technician.
If you have wireless sensors then this signal can indicate that the batteries in a particular sensor are getting weak and need replacing. If this is the case it is recommended that whilst you replace the batteries in the faulty sensor it is good practice to replace all your wireless devices batteries.