Burnham Boiler Fault Codes and Troubleshooting

Burnham has been manufacturing boilers for over 150 years and remains a popular choice for residential hot water and steam heating systems throughout the Midwest. Like all modern gas boilers, Burnham systems use electronic controls that log and display fault codes when something goes wrong. This guide covers fault codes for common Burnham residential boilers including the ES2, MegaSteam, Alpine, and K2 series.

How Burnham Boiler Controls Report Faults

Burnham's diagnostic display varies by product line. The Alpine and K2 series high-efficiency condensing boilers use a digital display that shows alphanumeric fault codes (e.g., "E01", "LO"). Older Burnham boilers may use LED flash codes or a simple lockout light without a specific code display. In all cases, the boiler control module logs the most recent fault, and in many cases a history of prior faults, which a technician can retrieve using the service menu.

Common Burnham Boiler Fault Codes

Understanding Low and High Pressure on Burnham Systems

Burnham hot water boilers are hydronic systems — they heat water and circulate it through radiators, baseboard units, or radiant tubing. The system must maintain proper water pressure to operate safely.

Low pressure (under 10 PSI): The low water cutoff trips to protect the heat exchanger from overheating without adequate water flow. You can add pressure through the manual fill valve on the incoming cold water supply line. Watch the pressure gauge and fill to 15 PSI. If pressure drops repeatedly, there is a leak in the system.

High pressure (over 25-30 PSI): The pressure relief valve will discharge if pressure exceeds its rating. High pressure can result from an expansion tank that has lost its air charge or a fill valve that won't close. This requires a technician.

What Homeowners Can Check

System pressure: Locate the pressure gauge and confirm it reads 12-15 PSI when the boiler is cool. Use the fill valve to restore low pressure.

Burner sight glass: Some Burnham models have a small glass port on the burner cover. When the boiler fires normally, you should see a blue/yellow flame. No flame during a heating call indicates an ignition fault.

Gas supply: Verify the manual gas shutoff near the boiler is open and other gas appliances work normally.

Flue vent termination: For Alpine and K2 condensing boilers with PVC venting, check the exterior vent for ice or blockage during winter.

Thermostat and zone controls: Confirm the thermostat is calling for heat and any zone valves, if present, are operating correctly.

When to Call a Professional

Gas valve faults, repeated ignition failures, high-limit trips that return after one reset, and any pressure-related fault that you cannot correct by adding water through the fill valve require professional service. Burnham boilers involve high-temperature water and gas combustion — both are hazardous without proper training and tools.

Burkhardt Heating, Cooling, Plumbing & Electric has been servicing Burnham boilers across Southeastern Wisconsin for over 60 years. Our technicians carry common Burnham parts and provide 24/7 emergency boiler service.

Burnham Boiler Repair in Southeastern Wisconsin

Boiler faults rarely resolve themselves. Early service prevents minor faults from escalating into heat exchanger failures or burst system components — and keeps your home warm when Wisconsin winters are at their worst.

If you see any of these codes, call Burkhardt at 414-206-3049. Our NATE-certified technicians can diagnose and repair the issue — usually in a single visit.

Ready to schedule service? Call Burkhardt Heating, Cooling, Plumbing & Electric at 414-206-3049 or contact us online. Available 24/7 for emergencies.