sean5302 Posted October 7, 2015 Share Posted October 7, 2015 Hi folks. I have a 14 year old Scantronic 9448ES alarm with newish Pyronix Belle box and 14 year old Pyronix hard-wired PIR detectors. There is a fault on zone 4, the PIR in the dining room. As soon as I try to set the alarm I get the beep beep at the keypad but zone 4 light stays lit continuously, followed by full alarm sounding after 20 seconds. Therefore zone 4 is in full alarm triggering mode. It won't go into engineer mode. I key 0 followed by 7890 and all LEDs should then flash, but they don't. Also, it won't walk test. No obvious response from anything when I key the relevant code in. You guys said I should loop out zone 4.(I asked the question before). Is that remove the 2 wires from zone 4 in the control panel and then bridge the terminals (ie closed) or do I leave theterminals unconnected to anything (ie open)? Nothing looks wrong with the PIR, which lights up when walked in front of, but I know neighbours who have had faults with their PIRs and had to get them changed. There's no spiders, dirt or obvious contamination. If I part set the alarm, omitting zone 4, all works fine. Any help greatly appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 7, 2015 Share Posted October 7, 2015 Either continue omitting the circuit or get the PIR swapped. Quote Link to comment Share on other sites More sharing options...
al-yeti Posted October 7, 2015 Share Posted October 7, 2015 Could be cable fault Loop it at the pir if it clears, that will to a point show it's pir at fault and then as above replace pir Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted October 7, 2015 Share Posted October 7, 2015 It won't go into engineer mode. I key 0 followed by 7890 and all LEDs should then flash, but they don't. This number given in the manual is only of relevance if the original installer did not change the default code. Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
james.wilson Posted October 7, 2015 Share Posted October 7, 2015 get someone to look at it. You have an issue. Dont make it any worse Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
sean5302 Posted October 8, 2015 Author Share Posted October 8, 2015 I'm not prepared to pay £200 to get someone out to it. By "loop it out" are you saying just fit a piece of wire across the terminals previously occupied by the PIR? Do I have to do that in Engineer Mode? If I just open the cover, remove the PIR wires from zone 4, bridge the terminals with wire, refit the cover and reset the alarm, would all be OK until I replace the PIR? Quote Link to comment Share on other sites More sharing options...
al-yeti Posted October 8, 2015 Share Posted October 8, 2015 Yeah you can try that , either way if not prepared to pay an engineer then you have to try yourself (don't loop the power obviously) Quote Link to comment Share on other sites More sharing options...
sean5302 Posted October 8, 2015 Author Share Posted October 8, 2015 I now have most of my answer and, unfortunately, it's not what I wanted to learn. Looping zone 4 out at the PIR doesn't cure the fault. Looping zone 4 out at the control panel does cure the fault. This suggests a wiring fault. I believe the wires are hidden behind the coving at wall/ceiling height. I cannot see anything other than a thick cable coming out of the control box and disappearing into the coving, which then turns through 3-off 90 degree bends before going 30 feet down the hall towards the dining room. Is it likely that this wiring will be clipped in place behind the coving? I don't know which would have been fixed first, probably when the house was being built. I suppose i could just ignore it and carry on, since the alarm works as intended except for in the dining room. I have once heard "rustling" as if from a mouse, but can't think how one would get inside the coving. I'll have a look upstairs but the only area with a few small places of access would be in the hot water cylinder cupboard upstairs. How do installers usually fit alarm wiring in new houses? I'd hope that I could tie a string to the cable behind the PIR in the dining room and pull the damaged cable out towards the control box, using the string to then thread a new cable in. More likely, I'll just ignore it. There is power to the PIR and also the tamper circuit works, so it's something with the 2 wires for NC and common. Any help gratefully received, please. Quote Link to comment Share on other sites More sharing options...
sean5302 Posted October 8, 2015 Author Share Posted October 8, 2015 I'm still a bit perplexed. The PIR cable has 6 wires in it. 2 power wires are OK ie 0 and 12V. The PIR lights up when I walk in front of it. 2 Tamper wires are OK. The tamper circuit activates on removing the PIR cover. There is a fault with either common or NC so the PIR is effectively open circuit. How can that be? Is that an unusual fault, please? I suppose I could check the connections again for the common and NC both at the PIR and the control box, but it does seem strange. What do folks think? Quote Link to comment Share on other sites More sharing options...
james.wilson Posted October 8, 2015 Share Posted October 8, 2015 The cables are probably under the floorboards. Mice like to chew cables. The alarm is only low voltage so no issue apart from the one you have. But if it's been chewing mains cables too you have a bigger worry Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
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