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
The boiler will not ignite; the display shows E01 and the burner never lights.
Ignition Failure Lockout
E02
The boiler attempts to start but quickly shuts down with E02 displayed.
Flame Loss During Operation
E03
The boiler locks out with E03; the fan may run briefly then stop, with no ignition.
Air Pressure Switch / Fan Proving Fault
E04
The boiler shuts down with E04; the display may indicate an overheat or high limit condition.
High Limit Temperature Lockout
E05
The boiler displays E05 and will not fire; this may indicate low water pressure or a low water cutoff.
Low Water Pressure / Low Water Cutoff Fault
E06
The boiler shows E06; this may indicate a supply temperature sensor error.
Supply Temperature Sensor Fault (NTC Open/Short)
E07
The boiler displays E07; this may indicate a return temperature sensor error.
Return Temperature Sensor Fault (NTC Open/Short)
E08
The boiler locks out with E08; the fan may run but with no ignition, often labeled as a fan or speed error.
Combustion Fan Speed / Feedback Fault
E09
The boiler shows E09 and shuts down; this is often associated with a flue gas temperature or sensor fault.
Flue Gas Temperature Sensor Fault / Overtemperature
E10
The boiler displays E10; this may indicate an outdoor sensor fault on weather-compensated Crown models.
Outdoor Temperature Sensor Fault
E11
The boiler shows E11; domestic hot water (DHW) may not function correctly on combi models.
DHW Temperature Sensor Fault
E12
Boiler locks out with E12; this may indicate a gas valve or modulation fault.
Gas Valve Control / Modulation Error
E13
Boiler shows E13; this may indicate ionization current is too low or a weak flame signal.
Weak Flame Signal
E14
Boiler displays E14; this may indicate an internal control board fault.
Control Board Self-Check Error
E15
Boiler shows E15; this may indicate a condensate drain or trap fault on condensing models.
Condensate Drain Blockage / Level Fault
E16
Boiler displays E16; this may indicate a flow sensor or flow switch fault.
System Flow Sensor / Flow Switch Error
E17
Boiler shows E17; this may indicate a pump fault or no circulation detected.
Internal Pump Failure / Pump Feedback Error
E18
Boiler displays E18; this may indicate a sensor mismatch or configuration error.
Configuration / Parameter Error
E19
Boiler shows E19; this may indicate a sensor calibration or delta-T error.
Temperature Differential Error
E20
Boiler displays E20; this may indicate a lockout due to repeated ignition failures.
Hard Lockout After Multiple Faults
Symptom
Boiler cycles on and off, but some radiators remain 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 the thermostat; it 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 requires topping 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 emanating 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; the 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 |
The boiler will not ignite; the display shows E01 and the burner never lights.
|
Ignition Failure Lockout | View Details |
| E02 |
The boiler attempts to start but quickly shuts down with E02 displayed.
|
Flame Loss During Operation | View Details |
| E03 |
The boiler locks out with E03; the fan may run briefly then stop, with no ignition.
|
Air Pressure Switch / Fan Proving Fault | View Details |
| E04 |
The boiler shuts down with E04; the display may indicate an overheat or high limit condition.
|
High Limit Temperature Lockout | View Details |
| E05 |
The boiler displays E05 and will not fire; this may indicate low water pressure or a low water cutoff.
|
Low Water Pressure / Low Water Cutoff Fault | View Details |
| E06 |
The boiler shows E06; this may indicate a supply temperature sensor error.
|
Supply Temperature Sensor Fault (NTC Open/Short) | View Details |
| E07 |
The boiler displays E07; this may indicate a return temperature sensor error.
|
Return Temperature Sensor Fault (NTC Open/Short) | View Details |
| E08 |
The boiler locks out with E08; the fan may run but with no ignition, often labeled as a fan or speed error.
|
Combustion Fan Speed / Feedback Fault | View Details |
| E09 |
The boiler shows E09 and shuts down; this is often associated with a flue gas temperature or sensor fault.
|
Flue Gas Temperature Sensor Fault / Overtemperature | View Details |
| E10 |
The boiler displays E10; this may indicate an outdoor sensor fault on weather-compensated Crown models.
|
Outdoor Temperature Sensor Fault | View Details |
| E11 |
The 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; this may indicate a gas valve or modulation fault.
|
Gas Valve Control / Modulation Error | View Details |
| E13 |
Boiler shows E13; this may indicate ionization current is too low or a weak flame signal.
|
Weak Flame Signal | View Details |
| E14 |
Boiler displays E14; this may indicate an internal control board fault.
|
Control Board Self-Check Error | View Details |
| E15 |
Boiler shows E15; this may indicate a condensate drain or trap fault on condensing models.
|
Condensate Drain Blockage / Level Fault | View Details |
| E16 |
Boiler displays E16; this may indicate a flow sensor or flow switch fault.
|
System Flow Sensor / Flow Switch Error | View Details |
| E17 |
Boiler shows E17; this may indicate a pump fault or no circulation detected.
|
Internal Pump Failure / Pump Feedback Error | View Details |
| E18 |
Boiler displays E18; this may indicate a sensor mismatch or configuration error.
|
Configuration / Parameter Error | View Details |
| E19 |
Boiler shows E19; this may indicate a sensor calibration or delta-T error.
|
Temperature Differential Error | View Details |
| E20 |
Boiler displays E20; this may indicate a lockout due to repeated ignition failures.
|
Hard Lockout After Multiple Faults | View Details |
| – |
Boiler cycles on and off, but some radiators remain 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 the thermostat; it 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 requires topping 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 emanating 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; the 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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