Crown
Crown Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Boiler will not ignite; display shows E01 and burner never lights
Ignition Failure Lockout
E02
Boiler attempts to start but shuts down quickly with E02 displayed
Flame Loss During Operation
E03
Boiler locks out with E03; fan may run briefly then stop, no ignition
Air Pressure Switch / Fan Proving Fault
E04
Boiler shuts down with E04; display may indicate overheat or high limit
High Limit Temperature Lockout
E05
Boiler displays E05 and will not fire; may indicate low water pressure or low water cutoff
Low Water Pressure / Low Water Cutoff Fault
E06
Boiler shows E06; may indicate supply temperature sensor error
Supply Temperature Sensor Fault (NTC Open/Short)
E07
Boiler displays E07; may indicate return temperature sensor error
Return Temperature Sensor Fault (NTC Open/Short)
E08
Boiler locks out with E08; fan may run but no ignition, often labeled fan or speed error
Combustion Fan Speed / Feedback Fault
E09
Boiler shows E09 and shuts down; often associated with flue gas temperature or sensor fault
Flue Gas Temperature Sensor Fault / Overtemperature
E10
Boiler displays E10; may indicate outdoor sensor fault on weather-compensated Crown models
Outdoor Temperature Sensor Fault
E11
Boiler shows E11; domestic hot water (DHW) may not function correctly on combi models
DHW Temperature Sensor Fault
E12
Boiler locks out with E12; may indicate gas valve or modulation fault
Gas Valve Control / Modulation Error
E13
Boiler shows E13; may indicate ionization current too low or flame signal weak
Weak Flame Signal
E14
Boiler displays E14; may indicate internal control board fault
Control Board Self-Check Error
E15
Boiler shows E15; may indicate condensate drain or trap fault on condensing models
Condensate Drain Blockage / Level Fault
E16
Boiler displays E16; may indicate flow sensor or flow switch fault
System Flow Sensor / Flow Switch Error
E17
Boiler shows E17; may indicate pump fault or no circulation detected
Internal Pump Failure / Pump Feedback Error
E18
Boiler displays E18; may indicate sensor mismatch or configuration error
Configuration / Parameter Error
E19
Boiler shows E19; may indicate sensor calibration or delta-T error
Temperature Differential Error
E20
Boiler displays E20; may indicate lockout due to repeated ignition failures
Hard Lockout After Multiple Faults
Symptom
Boiler cycles on and off but some radiators stay cold while others are hot
Imbalanced Heating / Air Lock
Symptom
Boiler display is on but unresponsive; buttons do not change settings
User Interface / Keypad Failure
Symptom
Boiler does not respond to thermostat; stays off even when there is a call for heat
Control Signal / Thermostat Circuit Fault
Symptom
Boiler emits a burning smell or plastic odor during operation
Overheating Component / Electrical Overload
Symptom
Boiler fires for central heating but does not produce domestic hot water on a combi model
No DHW Production
Symptom
Boiler flue terminal outside shows signs of condensate staining or dripping on the wall
Condensate Management / Flue Termination Issue
Symptom
Boiler frequently loses pressure and needs to be topped up
Chronic Pressure Loss
Symptom
Boiler frequently short cycles, turning on and off every few minutes
Short Cycling / Oversized Boiler or Control Issue
Symptom
Boiler frequently trips the house circuit breaker
Electrical Overload / Short Circuit
Symptom
Boiler is very noisy with a grinding or rattling sound from the fan area
Combustion Fan Mechanical Failure
Symptom
Boiler leaks water from the bottom or inside the cabinet
Internal Water Leak
Symptom
Boiler locks out intermittently during windy conditions without a clear error code
Wind-Induced Flue Disturbance
Symptom
Boiler makes loud banging or knocking noises when starting or during operation
Kettling / Water Hammer / Expansion Noise
Symptom
Boiler or nearby piping emits a high-pitched whistling or howling noise
Flow Restriction / Cavitation
Symptom
Boiler room smells strongly of gas when the boiler attempts to fire
Gas Leak / Incomplete Ignition
Symptom
Boiler runs but domestic hot water is not hot enough on a Crown combi boiler
Insufficient DHW Output
Symptom
Boiler runs but radiators or baseboards stay cold; no heat delivered to the home
No Circulation / Hydronic Flow Failure
Symptom
Boiler will not start at all; display is blank and there are no lights or sounds
No Power to Boiler
Symptom
Water is dripping from the pressure relief valve discharge pipe
Overpressure / Relief Valve Discharge
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler will not ignite; display shows E01 and burner never lights
|
Ignition Failure Lockout | View Details |
| E02 |
Boiler attempts to start but shuts down quickly with E02 displayed
|
Flame Loss During Operation | View Details |
| E03 |
Boiler locks out with E03; fan may run briefly then stop, no ignition
|
Air Pressure Switch / Fan Proving Fault | View Details |
| E04 |
Boiler shuts down with E04; display may indicate overheat or high limit
|
High Limit Temperature Lockout | View Details |
| E05 |
Boiler displays E05 and will not fire; may indicate low water pressure or low water cutoff
|
Low Water Pressure / Low Water Cutoff Fault | View Details |
| E06 |
Boiler shows E06; may indicate supply temperature sensor error
|
Supply Temperature Sensor Fault (NTC Open/Short) | View Details |
| E07 |
Boiler displays E07; may indicate return temperature sensor error
|
Return Temperature Sensor Fault (NTC Open/Short) | View Details |
| E08 |
Boiler locks out with E08; fan may run but no ignition, often labeled fan or speed error
|
Combustion Fan Speed / Feedback Fault | View Details |
| E09 |
Boiler shows E09 and shuts down; often associated with flue gas temperature or sensor fault
|
Flue Gas Temperature Sensor Fault / Overtemperature | View Details |
| E10 |
Boiler displays E10; may indicate outdoor sensor fault on weather-compensated Crown models
|
Outdoor Temperature Sensor Fault | View Details |
| E11 |
Boiler shows E11; domestic hot water (DHW) may not function correctly on combi models
|
DHW Temperature Sensor Fault | View Details |
| E12 |
Boiler locks out with E12; may indicate gas valve or modulation fault
|
Gas Valve Control / Modulation Error | View Details |
| E13 |
Boiler shows E13; may indicate ionization current too low or flame signal weak
|
Weak Flame Signal | View Details |
| E14 |
Boiler displays E14; may indicate internal control board fault
|
Control Board Self-Check Error | View Details |
| E15 |
Boiler shows E15; may indicate condensate drain or trap fault on condensing models
|
Condensate Drain Blockage / Level Fault | View Details |
| E16 |
Boiler displays E16; may indicate flow sensor or flow switch fault
|
System Flow Sensor / Flow Switch Error | View Details |
| E17 |
Boiler shows E17; may indicate pump fault or no circulation detected
|
Internal Pump Failure / Pump Feedback Error | View Details |
| E18 |
Boiler displays E18; may indicate sensor mismatch or configuration error
|
Configuration / Parameter Error | View Details |
| E19 |
Boiler shows E19; may indicate sensor calibration or delta-T error
|
Temperature Differential Error | View Details |
| E20 |
Boiler displays E20; may indicate lockout due to repeated ignition failures
|
Hard Lockout After Multiple Faults | View Details |
| – |
Boiler cycles on and off but some radiators stay cold while others are hot
|
Imbalanced Heating / Air Lock | View Details |
| – |
Boiler display is on but unresponsive; buttons do not change settings
|
User Interface / Keypad Failure | View Details |
| – |
Boiler does not respond to thermostat; stays off even when there is a call for heat
|
Control Signal / Thermostat Circuit Fault | View Details |
| – |
Boiler emits a burning smell or plastic odor during operation
|
Overheating Component / Electrical Overload | View Details |
| – |
Boiler fires for central heating but does not produce domestic hot water on a combi model
|
No DHW Production | View Details |
| – |
Boiler flue terminal outside shows signs of condensate staining or dripping on the wall
|
Condensate Management / Flue Termination Issue | View Details |
| – |
Boiler frequently loses pressure and needs to be topped up
|
Chronic Pressure Loss | View Details |
| – |
Boiler frequently short cycles, turning on and off every few minutes
|
Short Cycling / Oversized Boiler or Control Issue | View Details |
| – |
Boiler frequently trips the house circuit breaker
|
Electrical Overload / Short Circuit | View Details |
| – |
Boiler is very noisy with a grinding or rattling sound from the fan area
|
Combustion Fan Mechanical Failure | View Details |
| – |
Boiler leaks water from the bottom or inside the cabinet
|
Internal Water Leak | View Details |
| – |
Boiler locks out intermittently during windy conditions without a clear error code
|
Wind-Induced Flue Disturbance | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or during operation
|
Kettling / Water Hammer / Expansion Noise | View Details |
| – |
Boiler or nearby piping emits a high-pitched whistling or howling noise
|
Flow Restriction / Cavitation | View Details |
| – |
Boiler room smells strongly of gas when the boiler attempts to fire
|
Gas Leak / Incomplete Ignition | View Details |
| – |
Boiler runs but domestic hot water is not hot enough on a Crown combi boiler
|
Insufficient DHW Output | View Details |
| – |
Boiler runs but radiators or baseboards stay cold; no heat delivered to the home
|
No Circulation / Hydronic Flow Failure | View Details |
| – |
Boiler will not start at all; display is blank and there are no lights or sounds
|
No Power to Boiler | View Details |
| – |
Water is dripping from the pressure relief valve discharge pipe
|
Overpressure / Relief Valve Discharge | View Details |
No matching codes found
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