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Yes you were right - there must have been a power issue with the PIR. Fiddling around with the battery, after a while the red light started flashing and the control unit recognised it again. Perhaps it is a dodgy wire from the battery. Thanks for your help.

In installer mode I replaced the battery of a 715r IR sensor unit. However the kids had an accident which caused me to forgot to exit installer mode for several hours. Now the main unit (scantronic 9752) cannot find the sensor - it says I have a radio zone supervision fail for zone13. I cannot...