The problem could be the thermostat itself or thermostat connections on the thermostat, or the thermostat connections on the circulator control, or the circulator control itself could be bad, or the 120 volt connections at the circulator control are loose, or the connections at the circulator are loose, or the circulator could be bad or the capacitor at the circulator could be bad.
If you have a volt-ohm meter and know how to use it, you will figure it out.
Its even possible that there is air in the zones and the circulator won't pull.
Chances are the control will only fire off the burners if its calling for heat so that would ELIMINATE the thermostat and connections as being the problem.
[Edited by oil lp man on 10-05-2004 at 12:45 PM]