The optex PIRs are top notch & I'd be surprised if it was the detector at fault. I've only ever replaced three optex PIRs in 16 years. If you are a novice then I would be dropping all power off ( mains & battery) before you attempt to change it. If the PIR is hardwired then there are no programming changes ro be made. You can use any PIR but I'd be sticking with the optex.
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