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Menvier DF4000 Heat Detector Problems

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Hello,

Have been having trouble getting heat detectors to trigger on a DF4000. Tried two different kits, and after replacing 700 series head with another spare one, it managed to trigger it after about 10 minutes.

I phoned Menvier, but the fellow couldn't help much. Is this a common problem? It's the second building that this has happened to me in the last couple of years.

The panel was picking up the increase in temperature just fine, just not triggering the alarm. Not sure if the problem's in the detector or the panel.

I'll post up some more details in a little while, but any ideas would be gratefully received!

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