Dettson
Dettson 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 start; control shows E01 and burner never lights
Ignition Failure Lockout
E02
Boiler attempts to start but shuts down quickly with E02 displayed
Flame Detection Failure
E03
Boiler locks out with E03; fan runs but burner does not light
Air Pressure Switch / Combustion Air Fault
E04
Boiler shuts down with E04 and will not restart until reset
High Limit Temperature Lockout
E05
Boiler displays E05 and does not respond to thermostat calls
Low Water Pressure / Low System Fill
E06
Boiler shows E06 and shuts down shortly after starting
Return Temperature Sensor Fault
E07
Boiler displays E07 and will not fire even though system pressure is normal
Flow Switch / Flow Sensor Fault
E08
Boiler shows E08 and fan does not start during a call for heat
Combustion Fan / Blower Fault
E09
Boiler locks out with E09 after several failed ignition attempts.
Gas Valve / Gas Supply Fault
E10
Boiler shows E10 and shuts down during operation, often with a hot supply temperature.
Supply Temperature Sensor Fault
E11
Boiler displays E11 and will not respond to thermostat or control inputs.
Communication / Control Board Fault
E12
Boiler shows E12 and shuts down shortly after ignition, often with noisy combustion.
Flue Gas Overtemperature / Flue Sensor Fault
E13
Boiler displays E13 and will not start; condensate is present around the unit.
Condensate Drain Fault
E14
Boiler shows E14 and cycles on and off rapidly without satisfying the heat demand.
Short Cycling / Minimum Run Time Fault
E15
Boiler displays E15 and domestic hot water (DHW) priority is not functioning correctly.
DHW Sensor / Priority Fault
E16
Boiler shows E16 and indicates an outdoor sensor error on the display.
Outdoor Temperature Sensor Fault
E17
Boiler displays E17 and indicates a pump or circulation error.
Primary Pump Fault
E18
Boiler shows E18 and indicates a sensor mismatch or configuration error.
Sensor Configuration / Parameter Fault
E19
Boiler displays E19, indicating an internal memory or parameter error.
Control Memory / EEPROM Fault
E20
Boiler displays E20, indicating a flame is present when there should be none.
False Flame Detection
Symptom
Boiler cabinet vibrates excessively during operation
Mechanical Vibration / Imbalance
Symptom
Boiler display is on but unresponsive to buttons or menu navigation
User Interface / Keypad Failure
Symptom
Boiler emits a strong gas smell near the unit, especially before ignition.
Gas Leak / Delayed Ignition
Symptom
Boiler frequently loses pressure and needs to be topped up.
Chronic Pressure Loss
Symptom
Boiler frequently trips the household circuit breaker or blows fuses
Electrical Overload / Short Circuit
Symptom
Boiler is leaking water from the bottom of the cabinet.
Internal Water Leak
Symptom
Boiler is very noisy; fan whines or rattles loudly during operation
Combustion Fan / Blower Noise
Symptom
Boiler makes gurgling or trickling water sounds inside the cabinet
Air in Boiler / Inadequate Air Separation
Symptom
Boiler makes loud banging or knocking noises when starting or stopping.
Water Hammer / Kettling
Symptom
Boiler operates but house does not reach set temperature in cold weather
Underheating / Capacity or Control Issue
Symptom
Boiler pressure rises excessively during heating and relief valve opens
Overpressure During Operation
Symptom
Boiler produces a burning or electrical smell during operation.
Overheating Electrical Component
Symptom
Boiler runs continuously and overshoots the thermostat setting
Control / Thermostat Overshoot
Symptom
Boiler runs, but some radiators or zones remain cold.
Poor Circulation / Air Lock
Symptom
Boiler short cycles on domestic hot water; hot water temperature fluctuates
DHW Temperature Instability
Symptom
Boiler starts but shuts down after a few seconds without displaying a code.
Soft Lockout / Safety Interruption
Symptom
Boiler vent terminal outside shows signs of sooting or black staining
Poor Combustion / Sooting
Symptom
Boiler will not start; the display is blank and no lights are on.
No Power / Dead Boiler
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler will not start; control shows E01 and burner never lights
|
Ignition Failure Lockout | View Details |
| E02 |
Boiler attempts to start but shuts down quickly with E02 displayed
|
Flame Detection Failure | View Details |
| E03 |
Boiler locks out with E03; fan runs but burner does not light
|
Air Pressure Switch / Combustion Air Fault | View Details |
| E04 |
Boiler shuts down with E04 and will not restart until reset
|
High Limit Temperature Lockout | View Details |
| E05 |
Boiler displays E05 and does not respond to thermostat calls
|
Low Water Pressure / Low System Fill | View Details |
| E06 |
Boiler shows E06 and shuts down shortly after starting
|
Return Temperature Sensor Fault | View Details |
| E07 |
Boiler displays E07 and will not fire even though system pressure is normal
|
Flow Switch / Flow Sensor Fault | View Details |
| E08 |
Boiler shows E08 and fan does not start during a call for heat
|
Combustion Fan / Blower Fault | View Details |
| E09 |
Boiler locks out with E09 after several failed ignition attempts.
|
Gas Valve / Gas Supply Fault | View Details |
| E10 |
Boiler shows E10 and shuts down during operation, often with a hot supply temperature.
|
Supply Temperature Sensor Fault | View Details |
| E11 |
Boiler displays E11 and will not respond to thermostat or control inputs.
|
Communication / Control Board Fault | View Details |
| E12 |
Boiler shows E12 and shuts down shortly after ignition, often with noisy combustion.
|
Flue Gas Overtemperature / Flue Sensor Fault | View Details |
| E13 |
Boiler displays E13 and will not start; condensate is present around the unit.
|
Condensate Drain Fault | View Details |
| E14 |
Boiler shows E14 and cycles on and off rapidly without satisfying the heat demand.
|
Short Cycling / Minimum Run Time Fault | View Details |
| E15 |
Boiler displays E15 and domestic hot water (DHW) priority is not functioning correctly.
|
DHW Sensor / Priority Fault | View Details |
| E16 |
Boiler shows E16 and indicates an outdoor sensor error on the display.
|
Outdoor Temperature Sensor Fault | View Details |
| E17 |
Boiler displays E17 and indicates a pump or circulation error.
|
Primary Pump Fault | View Details |
| E18 |
Boiler shows E18 and indicates a sensor mismatch or configuration error.
|
Sensor Configuration / Parameter Fault | View Details |
| E19 |
Boiler displays E19, indicating an internal memory or parameter error.
|
Control Memory / EEPROM Fault | View Details |
| E20 |
Boiler displays E20, indicating a flame is present when there should be none.
|
False Flame Detection | View Details |
| – |
Boiler cabinet vibrates excessively during operation
|
Mechanical Vibration / Imbalance | View Details |
| – |
Boiler display is on but unresponsive to buttons or menu navigation
|
User Interface / Keypad Failure | View Details |
| – |
Boiler emits a strong gas smell near the unit, especially before ignition.
|
Gas Leak / Delayed Ignition | View Details |
| – |
Boiler frequently loses pressure and needs to be topped up.
|
Chronic Pressure Loss | View Details |
| – |
Boiler frequently trips the household circuit breaker or blows fuses
|
Electrical Overload / Short Circuit | View Details |
| – |
Boiler is leaking water from the bottom of the cabinet.
|
Internal Water Leak | View Details |
| – |
Boiler is very noisy; fan whines or rattles loudly during operation
|
Combustion Fan / Blower Noise | View Details |
| – |
Boiler makes gurgling or trickling water sounds inside the cabinet
|
Air in Boiler / Inadequate Air Separation | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping.
|
Water Hammer / Kettling | View Details |
| – |
Boiler operates but house does not reach set temperature in cold weather
|
Underheating / Capacity or Control Issue | View Details |
| – |
Boiler pressure rises excessively during heating and relief valve opens
|
Overpressure During Operation | View Details |
| – |
Boiler produces a burning or electrical smell during operation.
|
Overheating Electrical Component | View Details |
| – |
Boiler runs continuously and overshoots the thermostat setting
|
Control / Thermostat Overshoot | View Details |
| – |
Boiler runs, but some radiators or zones remain cold.
|
Poor Circulation / Air Lock | View Details |
| – |
Boiler short cycles on domestic hot water; hot water temperature fluctuates
|
DHW Temperature Instability | View Details |
| – |
Boiler starts but shuts down after a few seconds without displaying a code.
|
Soft Lockout / Safety Interruption | View Details |
| – |
Boiler vent terminal outside shows signs of sooting or black staining
|
Poor Combustion / Sooting | View Details |
| – |
Boiler will not start; the display is blank and no lights are on.
|
No Power / Dead Boiler | View Details |
No matching codes found
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