Help needed to stop unwanted alarm sounding

[Eldwick Man]

I am hoping one of the wise sages on the list will be able to help me sort out recent alarm(ing) problem!
My moho is an 2017 Marquis Majestic on a Puegot Boxer base. The alarm is Puegot factory fitted. Recently, during the hours of darkness the alarm has taken to sounding, needless to say annoying the neighbours.
All widows and doors are securely closed and as far as I can see there are no vermin inside the moho. It is stored between two building and not in a wind tunnel. There is no evidence of anyone attempting to break in. The problem has occurred with mains HU connected and without.
The starter battery, which powers the alarm system, appears to be OK as I have no problems starting the engine.
The fault does not occur every night but on a couple of occasions the alarm has sounded several times through the hours of darkness. It does not happen in the daytime.
HELP, please

 

[joka250]

Close off heater vents so they are directed to floor not face or screen. Check for mice.

 

[Two on Tour]

If you have a PIR sensor on the ceiling then the battery may need changing or you could have a moth or bug that is setting off the internal sensors.

Have you tried setting the alarm with the internal sensors disarmed to determine if the fault may be with them or the rest of the system.

We and others have had a problem with the bonnet switch due to the soft under bonnet sound proofing compressing and ours has been set off before with leaving the heater vent control on the fresh air position and a gust off wind setting the ultrasonic sensors off, we switch to the recycling air position now when we set the alarm.

 

[Eldwick Man]

Thanks they are some good tips.
What was done to ensure bonnet switch was making contact?
Had thought about bugs and have sprayed the inside with 'fly spray'.
Will give the fresh air vent a check.

 

[Two on Tour]

I glued a small aluminium plate to the sound proofing where the switch plunger strikes.

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[Riverbankannie]

Thanks they are some good tips.
What was done to ensure bonnet switch was making contact?
Had thought about bugs and have sprayed the inside with 'fly spray'.
Will give the fresh air vent a check.

We unclipped the under bonnet lining and glued a piece of unsquashable closed cell foam between it and the steel bonnet.

 

[skylinersi]

and worth making sure its not some scroat doing it, to get you to turn alarm off!!!!!!!!!!!!!!

 

[Eldwick Man]

Problem still not resolved and going off to France and Spain today travelling for 5 weeks, not happy about the risk.
Tried bonnet trick, didn't work in this case but can see the reasoning as there is a depression in foam insulation at site of switch.
Had habitation and starter batteries checked, all OK both for charge and 'load'.
Puegeot have looked at problem but as it's not their alarm system unable to fault.
On thursday spent almost whole day with dealer technician who was in contact with manufacturer (of alarm) and still cannot identify fault. 'IT' (used to be 'Nessie' but now 'IT' , we've fallen out of love!) goes back to dealer upon return from travels.
The fault is actually more complicated than first thought. Still goes off intermittantly, mainly at night but not always. There are three different motion sensors inside 'IT' plus a sensor on the habitation door . During the testing it has been found that, sometimes, the inside is armed but other times when alarmed you can open the habitation door (supposedly alarmed) and move about inside without setting off the alarm. Ahhhhhh.

 

[Riverbankannie]

That’s a pain. Hope it doesn’t spoil your trip .
We are off to France today too and have just discovered a leaking tap in washroom and now worried it could be dripping behind unit onto floor so undecided what to do !

 

[chaser]

Problem still not resolved and going off to France and Spain today travelling for 5 weeks, not happy about the risk.
Tried bonnet trick, didn't work in this case but can see the reasoning as there is a depression in foam insulation at site of switch.
Had habitation and starter batteries checked, all OK both for charge and 'load'.
Puegeot have looked at problem but as it's not their alarm system unable to fault.
On thursday spent almost whole day with dealer technician who was in contact with manufacturer (of alarm) and still cannot identify fault. 'IT' (used to be 'Nessie' but now 'IT' , we've fallen out of love!) goes back to dealer upon return from travels.
The fault is actually more complicated than first thought. Still goes off intermittantly, mainly at night but not always. There are three different motion sensors inside 'IT' plus a sensor on the habitation door . During the testing it has been found that, sometimes, the inside is armed but other times when alarmed you can open the habitation door (supposedly alarmed) and move about inside without setting off the alarm. Ahhhhhh.

Why not just switch it off?

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[barsteward]

The alarm system wouldn't be Autowatch would it?

 

[Pausim]

My alarm had a phase of going off unexpectedly. The manufacturer sent me a ceramic screwdriver so that I could re-adjust the sensitivity. Problem solved.

I believe the ceramic screwdriver is needed because a steel one can become magnetic and interfere with the delicate balance of the unit. This in turn suggests that magnetic influences near the control unit could affect it. There seems to be a very delicate balance to be maintained.

 

[Eldwick Man]

Why not just switch it off? Good idea! that's what I am having to do at night BUT, the habitation can easily be entered via a break-in so I'm having very sleepless nights getting up at the slightest sound.

Not certain about make of alarm, the technician at dealer was speaking to a company called 'Base'.

"Ceramic screwdriver" sounds interesting, perhaps I can borrow a 'Sonic screwdriver' from Dr Who, that might do the trick

Leaving home now to drive south, at least whilst I'm in 'IT' I don't need the alarm on

Whilst in France and Spain over the next few weeks, if anyone encounters a Majestic 155 with the alarm going off please don't give me pain, I've got enough.