A Burnham boiler can be fixed by adjusting the thermostat, inspecting the circulator pump and checking the temperature and pressure levels. The exact steps necessary to troubleshoot a Burnham boiler depends on the specific model.
First, make sure the thermostat is at the correct settings. The thermostat must be set above the prevailing room temperature. It should also be replaced if faulty to fix the problem.
Next, check to see if the circulator pump is running. A circulator pump that is not running is usually caused by a fault in the power supply line to the boiler. Appliance owners should check the breaker in this case and replace it if burned. A pump that is running but feels very hot is usually caused by a faulty motor, which needs to be replaced in order to fix the problem.
Finally, make sure the temperature and pressure are normal. Abnormally low temperatures or pressure is usually caused by a closed vent damper. The unit should be turned off at the breaker, left for a few minutes and then turned back on to fix the problem. If this does not work, the problem could be with the boiler control, which needs to be replaced by a professional appliance repair person.