Strange alarm behaviour

I don't have any of that model, but the spec sheet says it has inbuilt resistors, as you've set the jumpers for 1K, do you need any external ones?

Ah... So the fitting instructions are particularly rubbish. Lots of pictures that don't make too much sense.

The wiring picture has RT and Ra depicted across sets of terminals so I have fitted the 1k ones from the old one across these terminals as shown in the picture and left the switches set at 1k to denote what resistor value I have used.

Judging by your comment if it does have inbuilt resistors should I set both to 1k and remove the resistors I added?

I could only see a low resolution data sheet, on their website, which provides zero clues.

I would think so, your resistors are likely ending up paralleled with the on-board ones selected by DIP switch, and causing wrong value to be seen by the panel.

Thanks Andy for your help. I tried searching online for the installation ma nual so I could send you the link but stumbled across a manual for a differ ent model which seemed to suggest all switches off means use my own resisto r otherwise use the switches for the onboard one. So suspect your instinct was right. Will give it a try when I get back and post results. .thanks again

Lee.

Hi Andy

Just wanted a huge thank you for your help. I would never have thought of that. Removed the resistors and set it back to 1k and it works a treat.

Thanks

Lee.

Great, now hope your spiders don't run fast enough to trigger the Doppler sensor

Noisy resistor or cable intermittent in some way, or even condensation, though less likely this time of year.

Brian