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Boiler trips RCD after about 5mins. ?

Apollo Myson (old), with seperate programmer and room stat. Have tried by-passing programmer - on/off via room stat, which still trips RCD. Could it br the pump which looks fairly new or somethging else perhaps..? cheers in advance.
Pierre, October 2008
I have the same issue at a clients property, anyone know if changing either of these items fixed the problem ?

Isaacerin, August 2010
Pump is faulty

Robert Adam, October 2008
tv supressor or boiler stat.

iain, October 2008
link Click here to see other fixes for Myson.