E is the engineering prog,how did you get it on that?it could be the standby battery,but you need special tester to check it,no,a test meter wont do!get yourself a new 7 amp battery,check the mains power going into the panel via the spur,next check any fuses in the panel,with a test meter,just looking at them wont do,then get back to us
gts
March 2011