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 burner does not light, fan may run briefly
Air Proving or Fan Speed Fault
Err 12
Boiler locks out with “Err 12” and may show 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 shows “Err 17” and shuts down when multiple zones call for heat
System Overpressure or Relief Event Detected
Err 18
Boiler intermittently shows “Err 18” and may ignore some zone calls
Communication Fault with External Zone Panel
Err 19
Boiler shows “Err 19” and fan runs but 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 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 very high or very low return water temperature
Return Temperature Sensor Fault
Err 8
Boiler display shows “Err 8” and 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 cycles on and off rapidly on oil primary control without locking out
Unstable Flame or Draft on Oil Burner
Symptom
Boiler display is on but unresponsive, buttons do not work or menu is frozen
Control Panel Freeze or Keypad Failure
Symptom
Boiler emits a strong burning or electrical smell during operation
Overheating Component or Electrical Fault
Symptom
Boiler frequently locks out during very cold weather but runs fine in milder temperatures
Marginal Venting or Combustion Under High Load
Symptom
Boiler frequently needs manual resetting on the primary control (oil-fired models)
Repeated Flame Failure on Oil Burner
Symptom
Boiler is very noisy, with humming, grinding, or squealing sounds
Mechanical Noise from Pump, Fan, or Burner
Symptom
Boiler makes loud banging or knocking noises when starting or during operation
Kettling or Water Hammer
Symptom
Boiler or flue area smells like exhaust or fumes, especially when running
Flue Gas Spillage or Venting Problem
Symptom
Boiler or nearby piping is leaking water onto the floor
System Water Leak
Symptom
Boiler pressure drops over time and requires frequent manual filling
Chronic System Pressure Loss
Symptom
Boiler runs but some or all radiators/baseboards stay cold
No Circulation to Heating Zones
Symptom
Boiler runs continuously and overshoots thermostat setting, house becomes too warm
Boiler Fails to Shut Off on Temperature
Symptom
Boiler short cycles, turning on and off frequently without satisfying thermostat
Short Cycling Due to Oversizing or Control Issues
Symptom
Boiler takes a very long time to heat the house, or cannot reach set temperature on cold days
Insufficient Boiler Output or System Capacity
Symptom
Boiler will not start at all, no lights or display, appears completely dead
No Power to Boiler
Symptom
Domestic hot water from indirect tank is insufficient or runs out quickly
Poor DHW Performance
Symptom
Pressure relief valve discharges water periodically, especially when 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
| 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 burner does not light, fan may run briefly
|
Air Proving or Fan Speed Fault | View Details |
| Err 12 |
Boiler locks out with “Err 12” and may show 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 shows “Err 17” and shuts down when multiple zones call for heat
|
System Overpressure or Relief Event Detected | View Details |
| Err 18 |
Boiler intermittently shows “Err 18” and may ignore some zone calls
|
Communication Fault with External Zone Panel | View Details |
| Err 19 |
Boiler shows “Err 19” and fan runs but 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 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 very high or very low return water temperature
|
Return Temperature Sensor Fault | View Details |
| Err 8 |
Boiler display shows “Err 8” and 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 cycles on and off rapidly on oil primary control without locking out
|
Unstable Flame or Draft on Oil Burner | View Details |
| – |
Boiler display is on but unresponsive, buttons do not work or menu is frozen
|
Control Panel Freeze or Keypad Failure | View Details |
| – |
Boiler emits a strong burning or electrical smell during operation
|
Overheating Component or Electrical Fault | 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 frequently needs manual resetting on the primary control (oil-fired models)
|
Repeated Flame Failure on Oil Burner | View Details |
| – |
Boiler is very noisy, with humming, grinding, or squealing sounds
|
Mechanical Noise from Pump, Fan, or Burner | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or during operation
|
Kettling or Water Hammer | View Details |
| – |
Boiler or flue area smells like exhaust or fumes, especially when running
|
Flue Gas Spillage or Venting Problem | View Details |
| – |
Boiler or nearby piping is leaking water onto the floor
|
System Water Leak | View Details |
| – |
Boiler pressure drops over time and requires frequent manual filling
|
Chronic System Pressure Loss | View Details |
| – |
Boiler runs but some or all radiators/baseboards stay cold
|
No Circulation to Heating Zones | View Details |
| – |
Boiler runs continuously and overshoots thermostat setting, house becomes too warm
|
Boiler Fails to Shut Off on Temperature | View Details |
| – |
Boiler short cycles, turning on and off frequently without satisfying thermostat
|
Short Cycling Due to Oversizing or Control Issues | View Details |
| – |
Boiler takes a very long time to heat the house, or cannot reach set temperature on cold days
|
Insufficient Boiler Output or System Capacity | 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 indirect tank is insufficient or runs out quickly
|
Poor DHW Performance | View Details |
| – |
Pressure relief valve discharges water periodically, especially when 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 |
No matching codes found
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