House alarm C&K system update

[needawin]

House alarm system C&K Securitech
Have the above system. Was working perfectly. Had the mains switched off to do a shower repair. When I switched the mains back on the alarm would not reset. No red light showing in the top left corner of the keypad where it normally shows. When I press any number on keypad the numbers all light up ok. Tried the resetting procedure but still no red light. All the sensors red lights working ok.

Have fitted new battery as advised. Still not working no red light. Any ideas?

[buildersmate]

Relates this original question.
http://www.theanswerb.../Question1105274.html