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How can I fix my 9800 Microprocessor Intruder alarm system ?

My MIAS is showing fault rt when I try to clear putting my alarm code it starts ringing but not the usual ring tone and I have trouble stopping it. When I do eventually stop it it returns to the rt fault again. Please can anyone help.
Claire, January 2012
As you have called it a MIAS you have the manual.
What does it say in the manual about rt?

Here is a clue
rt Illegal use of keypad (excess number of keypresses).

So read the manual on how it works and use the right code.

Alarm, January 2012
link Click here to see other fixes for 9800.