Scantronic 9651pd Reset

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Hi, can anyone help please? My Scantronic 9651 alarm was going off randomly during the night. I changed the battery and it seems to have calmed it down but now the panel doesn't read anything and all 3 lights are lit up. I tried to do the engineer reset but I only get the message "r99 EHue", can anyone help please?
 

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Completely down power the system mains and battery …. Then re power mains first ….if it’s still showing the same thing , then it looks like it’s faulty as that isn’t a normal display setting
 
Thanks I think I've got to the bottom of it, system seems to have reset completely and is showing 01/01/2005 and isn't getting any mains power so the fuse in the box could be away. Waiting on a multimeter to check, otherwise the whole thing is getting ripped out!
 
They aren’t normally an issue , check the small fuse on the mains input block inside the main panel as I’ve known this blow after a faulty battery , post picture of main pcb as the later ones don’t have fuses on the main pcb
 
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