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The sensor was installed in December. There are a few different versions of the MX-40. The QZ, QX etc. Does it matter which one I get? The QX is very cheap.

In what way it the Optex better? Why are you confident it will fix the problem? Can it be used in a system with no EOL resistors?

Switch the Dual-tec back on last night and bingo, another false alarm today. That's with the microwave sensitivity turned almost fully down. I take it no one knows what the fast-blink code means?

I checked the voltage and it was 13.7v. I also dialled back the microwave sensitivity a bit more so it's picking up at he far end of the shed and no more. Before doing that I got my son to walk around the outside of the shed to see if the microwave sensor saw him and it didn't.

No, I'll try that. I don't have another detector to try, the other zones are magnetic latches. Are the Texecom and Optex sensors better? We've got dual-tec sensors in the factory at work and they've never given a false alarm in years of service.

Mostly space. There is a seating area at one end, work space in the middle and the far end will store bikes. So you've got a large bench, wooden rack with tools and sundries, pictures and signs on the walls. I don't know if it has anti-marking. There are metal objects in the shed, a bike stand...

Thank you for the input. To my knowledge the temperature in the shed has not been below -10 and certainly would not have been during most of the false alarms. There are no cobwebs and condensation is unlikely. I had not thought about the microwaves passing through the shed. It would be...

The ambient temperature is not something I'd considered. I didn't know these microwave sensors were temperature sensitive. One of the false alarms was at three in the morning but the others were all during the day. It's winter so it is cold at times but I don't remember the false alarms...

Hello, I have installed an Accenta Mini system with LCD RKP and a Honeywell DT8016F5 Dual-Tec PIR in a large wooden shed and the PIR is giving me intermittent false alarms. The system worked perfectly for about a month, zero false alarms. Then a false alarm three days in a row! After that...