Bradford White Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Boiler display shows E0 and unit will not fire; control appears unresponsive to thermostat call for heat.
Control Board Communication Fault
E1
Boiler shows E1 and will not ignite; fan may run briefly then shut down.
Ignition Failure / Ignition Lockout
E10
Boiler displays E10 and will not start; may indicate fan or inducer failure.
Inducer Fan Fault
E11
Boiler shows E11 and locks out; often associated with gas valve or ignition control issues.
Gas Valve / Gas Control Fault
E12
Boiler displays E12 and may shut down intermittently; often related to outdoor reset sensor issues on models equipped with outdoor reset.
Outdoor Temperature Sensor Fault
E13
Boiler shows E13 and locks out; may indicate internal control fault or EEPROM error.
Internal Control Memory / Configuration Fault
E14
Boiler displays E14 and shuts down; often associated with flue or air pressure sensor calibration issues on advanced models.
Flue / Air Pressure Sensor Calibration Fault
E15
Boiler shows E15 and may continue to run at reduced output; indicates communication error with optional modules (e.g., cascade or remote control).
External Module Communication Fault
E2
Boiler displays E2 and shuts down shortly after starting; burner may light briefly then go out.
Flame Loss / Flame Signal Weak
E3
Boiler shows E3 and will not start; inducer fan may not run or stops quickly.
Pressure Switch Open / Air Proving Fault
E4
Boiler display shows E4 and shuts down; may occur after running for a short period.
High Limit Temperature Lockout
E5
Boiler shows E5 and will not fire; may indicate a sensor out of range or wiring fault.
Supply Temperature Sensor Fault
E6
Boiler displays E6 and may shut down or operate erratically; return temperature reading appears incorrect.
Return Temperature Sensor Fault
E7
Boiler shows E7 and shuts down; may indicate flue gas temperature too high.
Flue Gas Temperature Overheat
E8
Boiler displays E8 and will not fire; may indicate low water pressure or flow.
Low System Water Pressure / Flow Fault
E9
Boiler shows E9 and locks out; may indicate condensate or drain-related issue on condensing models.
Condensate Drain Fault
Symptom
Boiler cycles on and off rapidly when only one small zone calls for heat.
Micro-Zoning / Low Load Short Cycling
Symptom
Boiler display is on but unresponsive or shows garbled characters.
User Interface / Display Failure
Symptom
Boiler emits a burning smell or plastic odor during operation.
Overheating Electrical Component or Dust Burn-off
Symptom
Boiler frequently locks out and must be manually reset, but no specific code is displayed or retained.
Intermittent Lockout / Nuisance Shutdown
Symptom
Boiler ignites with a loud boom or delayed ignition noise.
Delayed Ignition
Symptom
Boiler is very noisy, with loud humming or grinding from the circulator area.
Circulator Pump Mechanical Failure
Symptom
Boiler locks out during very cold or very windy weather only.
Weather-Related Venting / Air Supply Issue
Symptom
Boiler makes loud banging or knocking noises when starting or during operation.
Kettling / Water Hammer
Symptom
Boiler or nearby piping is leaking water onto the floor.
System Water Leak
Symptom
Boiler runs but does not provide enough heat to the home; radiators or baseboards are lukewarm.
Insufficient Heating Output
Symptom
Boiler runs but domestic hot water from an indirect tank or combi function is not hot enough.
Insufficient Domestic Hot Water Production
Symptom
Boiler short cycles, turning on and off frequently without long run times.
Short Cycling
Symptom
Boiler will not start at all; no lights or display, completely dead.
No Power to Boiler
Symptom
Boiler’s automatic air vent is leaking water or spraying mist.
Failed Automatic Air Vent
Symptom
Boiler’s condensate trap overflows or water drips from the bottom of the boiler cabinet on a condensing model.
Condensate Backup / Internal Leak
Symptom
Boiler’s gas burner flame appears yellow and lazy instead of blue and stable.
Improper Combustion / Yellow Flame
Symptom
Boiler’s hot surface igniter glows but burner does not light.
No Ignition with Hot Surface Igniter
Symptom
Boiler’s ignition spark is visible but burner does not light.
No Ignition with Spark Present
Symptom
Boiler’s low water cutoff trips frequently even though the system appears full.
Nuisance Low Water Cutoff Trip
Symptom
Boiler’s pressure relief valve is discharging water frequently or continuously.
Overpressure / Relief Valve Discharge
Symptom
Boiler’s system pressure drops over time without visible leaks.
Hidden System Leak / Pressure Loss
Symptom
Boiler’s thermostat calls for heat but boiler does not respond; no error code displayed.
No Response to Thermostat Call
Symptom
Boiler’s vent termination shows signs of sooting or black staining.
Incomplete Combustion / Sooting
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Boiler display shows E0 and unit will not fire; control appears unresponsive to thermostat call for heat.
|
Control Board Communication Fault | View Details |
| E1 |
Boiler shows E1 and will not ignite; fan may run briefly then shut down.
|
Ignition Failure / Ignition Lockout | View Details |
| E10 |
Boiler displays E10 and will not start; may indicate fan or inducer failure.
|
Inducer Fan Fault | View Details |
| E11 |
Boiler shows E11 and locks out; often associated with gas valve or ignition control issues.
|
Gas Valve / Gas Control Fault | View Details |
| E12 |
Boiler displays E12 and may shut down intermittently; often related to outdoor reset sensor issues on models equipped with outdoor reset.
|
Outdoor Temperature Sensor Fault | View Details |
| E13 |
Boiler shows E13 and locks out; may indicate internal control fault or EEPROM error.
|
Internal Control Memory / Configuration Fault | View Details |
| E14 |
Boiler displays E14 and shuts down; often associated with flue or air pressure sensor calibration issues on advanced models.
|
Flue / Air Pressure Sensor Calibration Fault | View Details |
| E15 |
Boiler shows E15 and may continue to run at reduced output; indicates communication error with optional modules (e.g., cascade or remote control).
|
External Module Communication Fault | View Details |
| E2 |
Boiler displays E2 and shuts down shortly after starting; burner may light briefly then go out.
|
Flame Loss / Flame Signal Weak | View Details |
| E3 |
Boiler shows E3 and will not start; inducer fan may not run or stops quickly.
|
Pressure Switch Open / Air Proving Fault | View Details |
| E4 |
Boiler display shows E4 and shuts down; may occur after running for a short period.
|
High Limit Temperature Lockout | View Details |
| E5 |
Boiler shows E5 and will not fire; may indicate a sensor out of range or wiring fault.
|
Supply Temperature Sensor Fault | View Details |
| E6 |
Boiler displays E6 and may shut down or operate erratically; return temperature reading appears incorrect.
|
Return Temperature Sensor Fault | View Details |
| E7 |
Boiler shows E7 and shuts down; may indicate flue gas temperature too high.
|
Flue Gas Temperature Overheat | View Details |
| E8 |
Boiler displays E8 and will not fire; may indicate low water pressure or flow.
|
Low System Water Pressure / Flow Fault | View Details |
| E9 |
Boiler shows E9 and locks out; may indicate condensate or drain-related issue on condensing models.
|
Condensate Drain Fault | View Details |
| – |
Boiler cycles on and off rapidly when only one small zone calls for heat.
|
Micro-Zoning / Low Load Short Cycling | View Details |
| – |
Boiler display is on but unresponsive or shows garbled characters.
|
User Interface / Display Failure | View Details |
| – |
Boiler emits a burning smell or plastic odor during operation.
|
Overheating Electrical Component or Dust Burn-off | View Details |
| – |
Boiler frequently locks out and must be manually reset, but no specific code is displayed or retained.
|
Intermittent Lockout / Nuisance Shutdown | View Details |
| – |
Boiler ignites with a loud boom or delayed ignition noise.
|
Delayed Ignition | View Details |
| – |
Boiler is very noisy, with loud humming or grinding from the circulator area.
|
Circulator Pump Mechanical Failure | View Details |
| – |
Boiler locks out during very cold or very windy weather only.
|
Weather-Related Venting / Air Supply Issue | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or during operation.
|
Kettling / Water Hammer | View Details |
| – |
Boiler or nearby piping is leaking water onto the floor.
|
System Water Leak | View Details |
| – |
Boiler runs but does not provide enough heat to the home; radiators or baseboards are lukewarm.
|
Insufficient Heating Output | View Details |
| – |
Boiler runs but domestic hot water from an indirect tank or combi function is not hot enough.
|
Insufficient Domestic Hot Water Production | View Details |
| – |
Boiler short cycles, turning on and off frequently without long run times.
|
Short Cycling | View Details |
| – |
Boiler will not start at all; no lights or display, completely dead.
|
No Power to Boiler | View Details |
| – |
Boiler’s automatic air vent is leaking water or spraying mist.
|
Failed Automatic Air Vent | View Details |
| – |
Boiler’s condensate trap overflows or water drips from the bottom of the boiler cabinet on a condensing model.
|
Condensate Backup / Internal Leak | View Details |
| – |
Boiler’s gas burner flame appears yellow and lazy instead of blue and stable.
|
Improper Combustion / Yellow Flame | View Details |
| – |
Boiler’s hot surface igniter glows but burner does not light.
|
No Ignition with Hot Surface Igniter | View Details |
| – |
Boiler’s ignition spark is visible but burner does not light.
|
No Ignition with Spark Present | View Details |
| – |
Boiler’s low water cutoff trips frequently even though the system appears full.
|
Nuisance Low Water Cutoff Trip | View Details |
| – |
Boiler’s pressure relief valve is discharging water frequently or continuously.
|
Overpressure / Relief Valve Discharge | View Details |
| – |
Boiler’s system pressure drops over time without visible leaks.
|
Hidden System Leak / Pressure Loss | View Details |
| – |
Boiler’s thermostat calls for heat but boiler does not respond; no error code displayed.
|
No Response to Thermostat Call | View Details |
| – |
Boiler’s vent termination shows signs of sooting or black staining.
|
Incomplete Combustion / Sooting | View Details |
No matching codes found
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