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Why does the sensor keep going off?

In one room only, the sensor keeps sounding. I have tries reset etc. How do I fix please ?
Sophia, January 2009
Pease disregard previous entry read your question incorrecly, possibly chime switch on or tamper fault check panel lights / lcd display for further information.

Ian, January 2009
Suggest the unit is replaced however possible faulty unit.

Ian, January 2009
Someone turned on 'chime'?

acorn, January 2009