Hot weather tripping reed switches

[Iwilldoit]

I have a very basic system 2 zones with daisy chained contact switches. No PIR
In the summer when its hot I get alarm trips. Problem is I dont know which switch is the cause, some are not lined up for optimal use but the door or window still has to be opened an inch before it tripped.
I have 5 on the zone that is tripping two of them are inset in the door the others are as the photo.
Is there a way to test each switch to find one that maybe is a bit weaker or something
Thank you.

Thank you

 

[Bear2Biker]

I've got those mounted inside on front & back UPVC door frames, both get outside full sun morning/evening & had a similar problem, turned out the screws were working loose due to expansion & contraction & alarm or tamper would go off at 10:15 every night as it cooled down !

The solution was to use a couple of spring or star washers on each screw, I did have to put slightly longer but flat thin head screws in, no recurrence in the last 6 years.

Not sure using a multimeter to test would detect any faults as you'd disturb the problem wires, you could just go ahead & add the springy washers.

 

[Iwilldoit]

That's a great tip and advice thanks I will try that.
Also i read somewhere that teenagers slamming doors can loosen the contacts and yes not through teenagers but with all the doors and windows open I do have an internal door with a recessed switch and that door has been slamming shut with the wind through the house. So I will also have a look at that one too.

 

[Iwilldoit]

Looking at the contacts I can not see how the screw could become loose enough to trigger but am willing to try.

I have some new contacts and looking through an eye glass I can see the reeds are closed and touching but when offer up the magnet I can not see the reeds separating. Or does it need the power going through it as I am just trying in my hand unconnected.