The EP2000 is a timer/programmer - it tells the boiler when to switch on - they don't fail very often - boiler problems are more likely.
When the EP2000 asks the boiler to run - does the fan in the boiler start up? If so you have a boiler problem. If not you may still have a boiler problem but it just might be the programmer.
After a call for heat a fan runs and a pressure switch detects that it's OK and the electronics light the pilot light and when that's detected as OK the main gas valve opens and the boiler fires up.
Pevvavi, April 2009
