Until today still no sign that the boiler will be working. Come with the new parts and tried to repair but another part now is not working. Don't give any damn any more to the technician. If they think the money my landlord paid them is not good enough, it's their problem, but don't leave us in the cold for more than one week now.
Update: 18/09/2008
Finally, the boiler is up and running. The technician says that he still need to replace the control circuit board but that is not top priority any more. As long as we got our hot water & heated house is good enough for us.