Any works done recently?
New carpets?
It could well be the bell, but stabbing in the dark isnt going to help you is it!
As before TRACE the fault. Isolate all until you find it.
Alarm
July 2011
At a guess Dave its probably your bell box tamper, and before no it probably hasnt been tampered with, but does contain components that will fail over time because it is outside and subject to all weather conditions.
Give me a call and i will tell you how to isolate it from the system.
07842 480037
Nick
July 2011
Trace & repair the tamper fault
acorn
July 2011
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