if you have no display at all and you have checked the fused spur fuse -3amp- check the fuse on the p.c.b if thats ok then im afraid its your pcb
steve taylor, June 2009
Sorry there is a missing full stop in the address below. It should read: www.idealboilers.com/docs/pdf./Isar_he_users_guide.pdf
Cledlyn, July 2008
Goto 'www.idealboilers.com/docs/pdf/Isar_he_users_Guide.pdf' and download the 4 page user guide.
Then goto: 'www.fixed4free.com/answers.php?id=30793' there you will find the possible answer to your question i.e. low system pressure.
There is more if you enter Isar HE30 in your Google search box
