I have an old Oil to Gas conversion boiler and for some reason I cannot get the boiler or the circulator pump to shut off. I have a digital thermostat and it is set for 65 degrees but the boiler keeps firing up and the temp in the House is now 72 degrees. The boiler will run for 3 minutes then shut of all the while the pump is running then after five minutes of being off the boiler fires back up again. I have baseboard hot water. Anyone know why its not following the thermostat, because it seems to be working as far as the thermostat display goes?
