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About 5 years ago I was given very clear instructions here by handymanjo to replace a battery on our 9800 alarm system that we inherited when we moved in some 20 years ago, a procedure I have repeated again recently. I have now decided to replace the aging bell box with a Texecom odyssey 1E, a...

We inherited an alarm system (9800 is only identifier) when we moved here 12 years ago, and till recently it's functioned perfectly although we have never had it serviced. Now, we are getting bF fault code and internal buzzer every now and then on the contol panel located in our hallway which...