Hi, can anyone help, I have an accenta g3 installed in my home and at times for the last few months on unsetting the system the pa led starts flashing, no audible noise just flashing, I press reset and all ok, I have been in the industry 30 years and have never come across this before and can't find any explanation online, any pointers would be appreciated, the system was installed approx 13/14 years ago.