Forgot Code Unset light Flashes?

Please can anybody help, i turned off electricity for 15 min to fix a light then alarm went off i tried to p[ut engineer code 1234 and 4321 cos the alarm was not set now alarm does not go off on house however the unset light flashes when front door is opened and box bleepes and outside alarm light permanetely flashes, would appreciate any help, we have forgotten the original code.

Thanks James