Burnham
Burnham Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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Err 1
Boiler will not fire, control display shows “Err 1” and burner never lights
Ignition Failure Lockout
Err 10
Boiler shows “Err 10” and will not fire, often after thermostat or wiring changes.
Thermostat or Demand Signal Fault
Err 11
Boiler display shows “Err 11” and the burner does not light; the fan may run briefly.
Air Proving or Fan Speed Fault
Err 12
Boiler locks out with “Err 12” and may show an abnormal supply/return temperature difference.
Flow Fault or Delta-T Out of Range
Err 13
Boiler shows “Err 13” and shuts down, often after running at high fire.
Flue Gas Temperature High or Sensor Fault
Err 14
Boiler intermittently displays “Err 14” and may reboot or lose settings.
Control Voltage or Power Supply Fault
Err 15
Boiler shows “Err 15” and will not modulate, stuck at low or high fire.
Gas Valve Modulation or Communication Fault
Err 16
Boiler display shows “Err 16” and domestic hot water (DHW) priority is not functioning correctly.
DHW Sensor or Priority Fault
Err 17
Boiler displays “Err 17” and shuts down when multiple zones call for heat.
System Overpressure or Relief Event Detected
Err 18
Boiler intermittently displays “Err 18” and may ignore some zone calls.
Communication Fault with External Zone Panel
Err 19
Boiler displays “Err 19” and the fan runs, but the burner does not light, often after service.
Gas Valve Proving or Internal Fault
Err 2
Boiler shuts down shortly after firing, display shows “Err 2” and burner cycles off on high temperature
High Limit Temperature Lockout
Err 20
Boiler display shows “Err 20” and the unit will not start, often after configuration changes.
Internal Configuration or Parameter Fault
Err 3
Boiler attempts to start but shuts down with “Err 3” before ignition, fan or circulator may run briefly
Low Water or LWCO Lockout
Err 4
Boiler locks out with “Err 4” and the vent fan may run continuously or not at all
Flue or Vent Pressure Fault
Err 5
Boiler display shows “Err 5” and burner shuts down after ignition, often within a few seconds
Flame Loss During Run
Err 6
Boiler control shows “Err 6” and will not start, often after a power outage or wiring work
Sensor or Thermistor Failure
Err 7
Boiler locks out with “Err 7” and may show a very high or very low return water temperature.
Return Temperature Sensor Fault
Err 8
Boiler display shows “Err 8” and the burner will not start, often accompanied by a very high temperature reading.
Outlet Temperature Overheat or Sensor Short
Err 9
Boiler intermittently shuts down with “Err 9” during operation, especially on cold days.
Outdoor Sensor Fault or Out-of-Range Reading
Symptom
Boiler display is on but unresponsive, buttons do not work, or the menu is frozen.
Control Panel Freeze or Keypad Failure
Symptom
Boiler frequently locks out during very cold weather but runs fine in milder temperatures.
Marginal Venting or Combustion Under High Load
Symptom
Boiler makes loud banging or knocking noises when starting or during operation.
Kettling or Water Hammer
Symptom
Boiler or nearby piping is leaking water onto the floor.
System Water Leak
Symptom
Boiler runs, but some or all radiators/baseboards remain cold.
No Circulation to Heating Zones
Symptom
Boiler short cycles, turning on and off frequently without satisfying the thermostat.
Short Cycling Due to Oversizing or Control Issues
Symptom
Boiler will not start at all; no lights or display, appears completely dead.
No Power to Boiler
Symptom
Domestic hot water from the indirect tank is insufficient or runs out quickly.
Poor DHW Performance
Symptom
Pressure relief valve discharges water periodically, especially when the boiler is hot.
Overpressure Discharge
Symptom
Some radiators or baseboards are hot at the top but cold at the bottom, or vice versa.
Airbound or Poor Heat Distribution
Symptom
The boiler cycles on and off rapidly on the oil primary control without locking out.
Unstable Flame or Draft on Oil Burner
Symptom
The boiler emits a strong burning or electrical smell during operation.
Overheating Component or Electrical Fault
Symptom
The boiler frequently needs manual resetting on the primary control (oil-fired models).
Repeated Flame Failure on Oil Burner
Symptom
The boiler is very noisy, with humming, grinding, or squealing sounds.
Mechanical Noise from Pump, Fan, or Burner
Symptom
The boiler or flue area smells like exhaust or fumes, especially when running.
Flue Gas Spillage or Venting Problem
Symptom
The boiler pressure drops over time and requires frequent manual filling.
Chronic System Pressure Loss
Symptom
The boiler runs continuously and overshoots the thermostat setting, causing the house to become too warm.
Boiler Fails to Shut Off on Temperature
Symptom
The boiler takes a very long time to heat the house, or cannot reach the set temperature on cold days.
Insufficient Boiler Output or System Capacity
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| Err 1 |
Boiler will not fire, control display shows “Err 1” and burner never lights
|
Ignition Failure Lockout | View Details |
| Err 10 |
Boiler shows “Err 10” and will not fire, often after thermostat or wiring changes.
|
Thermostat or Demand Signal Fault | View Details |
| Err 11 |
Boiler display shows “Err 11” and the burner does not light; the fan may run briefly.
|
Air Proving or Fan Speed Fault | View Details |
| Err 12 |
Boiler locks out with “Err 12” and may show an abnormal supply/return temperature difference.
|
Flow Fault or Delta-T Out of Range | View Details |
| Err 13 |
Boiler shows “Err 13” and shuts down, often after running at high fire.
|
Flue Gas Temperature High or Sensor Fault | View Details |
| Err 14 |
Boiler intermittently displays “Err 14” and may reboot or lose settings.
|
Control Voltage or Power Supply Fault | View Details |
| Err 15 |
Boiler shows “Err 15” and will not modulate, stuck at low or high fire.
|
Gas Valve Modulation or Communication Fault | View Details |
| Err 16 |
Boiler display shows “Err 16” and domestic hot water (DHW) priority is not functioning correctly.
|
DHW Sensor or Priority Fault | View Details |
| Err 17 |
Boiler displays “Err 17” and shuts down when multiple zones call for heat.
|
System Overpressure or Relief Event Detected | View Details |
| Err 18 |
Boiler intermittently displays “Err 18” and may ignore some zone calls.
|
Communication Fault with External Zone Panel | View Details |
| Err 19 |
Boiler displays “Err 19” and the fan runs, but the burner does not light, often after service.
|
Gas Valve Proving or Internal Fault | View Details |
| Err 2 |
Boiler shuts down shortly after firing, display shows “Err 2” and burner cycles off on high temperature
|
High Limit Temperature Lockout | View Details |
| Err 20 |
Boiler display shows “Err 20” and the unit will not start, often after configuration changes.
|
Internal Configuration or Parameter Fault | View Details |
| Err 3 |
Boiler attempts to start but shuts down with “Err 3” before ignition, fan or circulator may run briefly
|
Low Water or LWCO Lockout | View Details |
| Err 4 |
Boiler locks out with “Err 4” and the vent fan may run continuously or not at all
|
Flue or Vent Pressure Fault | View Details |
| Err 5 |
Boiler display shows “Err 5” and burner shuts down after ignition, often within a few seconds
|
Flame Loss During Run | View Details |
| Err 6 |
Boiler control shows “Err 6” and will not start, often after a power outage or wiring work
|
Sensor or Thermistor Failure | View Details |
| Err 7 |
Boiler locks out with “Err 7” and may show a very high or very low return water temperature.
|
Return Temperature Sensor Fault | View Details |
| Err 8 |
Boiler display shows “Err 8” and the burner will not start, often accompanied by a very high temperature reading.
|
Outlet Temperature Overheat or Sensor Short | View Details |
| Err 9 |
Boiler intermittently shuts down with “Err 9” during operation, especially on cold days.
|
Outdoor Sensor Fault or Out-of-Range Reading | View Details |
| – |
Boiler display is on but unresponsive, buttons do not work, or the menu is frozen.
|
Control Panel Freeze or Keypad Failure | View Details |
| – |
Boiler frequently locks out during very cold weather but runs fine in milder temperatures.
|
Marginal Venting or Combustion Under High Load | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or during operation.
|
Kettling or Water Hammer | View Details |
| – |
Boiler or nearby piping is leaking water onto the floor.
|
System Water Leak | View Details |
| – |
Boiler runs, but some or all radiators/baseboards remain cold.
|
No Circulation to Heating Zones | View Details |
| – |
Boiler short cycles, turning on and off frequently without satisfying the thermostat.
|
Short Cycling Due to Oversizing or Control Issues | View Details |
| – |
Boiler will not start at all; no lights or display, appears completely dead.
|
No Power to Boiler | View Details |
| – |
Domestic hot water from the indirect tank is insufficient or runs out quickly.
|
Poor DHW Performance | View Details |
| – |
Pressure relief valve discharges water periodically, especially when the boiler is hot.
|
Overpressure Discharge | View Details |
| – |
Some radiators or baseboards are hot at the top but cold at the bottom, or vice versa.
|
Airbound or Poor Heat Distribution | View Details |
| – |
The boiler cycles on and off rapidly on the oil primary control without locking out.
|
Unstable Flame or Draft on Oil Burner | View Details |
| – |
The boiler emits a strong burning or electrical smell during operation.
|
Overheating Component or Electrical Fault | View Details |
| – |
The boiler frequently needs manual resetting on the primary control (oil-fired models).
|
Repeated Flame Failure on Oil Burner | View Details |
| – |
The boiler is very noisy, with humming, grinding, or squealing sounds.
|
Mechanical Noise from Pump, Fan, or Burner | View Details |
| – |
The boiler or flue area smells like exhaust or fumes, especially when running.
|
Flue Gas Spillage or Venting Problem | View Details |
| – |
The boiler pressure drops over time and requires frequent manual filling.
|
Chronic System Pressure Loss | View Details |
| – |
The boiler runs continuously and overshoots the thermostat setting, causing the house to become too warm.
|
Boiler Fails to Shut Off on Temperature | View Details |
| – |
The boiler takes a very long time to heat the house, or cannot reach the set temperature on cold days.
|
Insufficient Boiler Output or System Capacity | View Details |
No matching codes found
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