Hi,
I have a hot water heat system with an oil burner. I recently changed out the control board and low water cut-off due to an electrical issue. I replaced them with the same models of both as before. Everything seems to work except now my boiler turns on (for 5-10 minutes) even when the thermostat is turned to "Off". I have read the manual and gone online and found that the system has a Lo Temp setting which is set on mine for 130° and a Hi setting of 180°. My system does not operate my hot water heater as that is electric. I don't remember the boiler doing this before I had to replace the parts. My question is How can I get this to stop since it wastes fuel oil? I was thinking of trying to lower the Lo Limit 60° but I didn't know if that could do any damage to my boiler.

Any help with this is greatly appreciated.

Thanks,
Matt

How did you test the old board before you decided it was bad and needed to be replaced? Could you have removed a good board and put a defective one in?