User guide here:
http://www.potterton.co.uk/docs/Potterton_Performa_System_HE_User_Guide.pdf
Some stuff here:
http://www.diynot.com/forums/viewtopic.php?t=283121
and more here:
http://howtomendit.com/answers.php?id=38628
Seems that there is a front panel control with "Reset" marked. Turn the knob to "Reset" and hld there for a few seconds. Plus there is also an internal reset buttnon mentioned in the above links
X, March 2015
