Vista 15 p?

So what's stopping you from finding another engineer?

In the meantime enter your code and press 1, that should silence the alert for a short time.

It's simple RF fault but you need an engineer.

e manno
December 2012

From the manual >

"The receiver is supervised and a trouble report is
sent (“CHECK 100” displayed) if communication
between the panel and receiver is interrupted, or
if no valid RF signals from at least one supervised
transmitter are received within 12 hours."

acorn
December 2012