Optima 2 plus - flashing Red Power LED on Keypad ?

["martin" <me@xxxxx>]

Hi,
I'm trying to sort out an old Optima 2 plus alarm which has been
disconnected from the mains
for a few months.

On reconnecting the power, by inserting the mains fuse back in the control
panel,
the alarm goes off but also the Power LED on the keypad flashes.

It has reverted back to the default 0123 Customer code and 9999 Engineering
code.

These can be entered and are accepted but the Power LED continues to flash
and the Green
'Day Mode' LED will not stay lit, although it lights briefly while the Reset
key is held down.

The battery is also dead but with mains power connected I do not think this
is causing the
problem. I can not see why any amount of resetting including clearing the
NVM
(by connecting terms 40 and 41) won't clear the flashing LED.

Can any one tell me what a flashing Power LED on the Keypad means if mains
power
is connected to the control panel ?

Regards

Martin