I have seen EP2000 but there is no reset button you have
shut power off and is auto reset
lal, August 2011
Does not seem to be a reset, remove power, and remove battery. See. http://www.gtts.co.uk/EP2001/PottertonEP2001CustomerGuide.pdf
And
http://www.gtts.co.uk/EP2001/PottertonEP2001InstallerGuide.pdf