De Dietrich Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Water heater does not start, burner will not ignite, lockout symbol on display
Ignition Failure / No Flame Detection
E02
Water heater shuts down shortly after ignition, display shows overheat / safety thermostat error
Overheat / Safety Thermostat Tripped
E03
Water heater attempts to start but shuts down with flue / exhaust error on display
Flue Gas / Exhaust System Fault
E04
Display shows water pressure / low pressure error, heater will not fire
Low System Water Pressure
E05
Display shows flow sensor / no circulation error, burner cycles rapidly or shuts down
Insufficient Water Flow Through Heat Exchanger
E06
Display shows DHW sensor error, water temperature unstable or unit shuts down
Domestic Hot Water Temperature Sensor Fault (NTC)
E07
Display shows flow/return sensor error; unit may overheat or shut down quickly.
Heating Circuit Flow or Return NTC Sensor Fault
E08
Display shows fan/air pressure error; burner does not ignite.
Combustion Fan or Air Pressure Switch Fault
E09
Display shows gas valve/modulation error; burner may light but not modulate correctly.
Gas Valve Control or Modulation Fault
E10
Display shows flame loss during operation; unit cycles on and off frequently.
Flame Instability / Flame Loss
E11
Display shows communication error between user interface and main board.
Control Board Communication Fault
E12
Display shows power supply/low voltage error; unit may reboot intermittently.
Mains Supply or Internal Power Fault
E13
Display shows condensate/drain error; unit locks out during operation.
Condensate Drain Blockage
E14
Display shows storage tank sensor error; cylinder temperature reading is incorrect.
Storage Cylinder Sensor Fault
E15
Display shows anti-legionella/disinfection fault; scheduled high-temperature cycle not completed.
Anti-Legionella Cycle Failure
E16
Display shows sensor short-circuit error; temperature reading is extremely high.
NTC Sensor Short Circuit
E17
Display shows sensor open-circuit error, temperature reading extremely low or -40°C.
NTC Sensor Open Circuit
E18
Display shows pump error; unit overheats or shuts down with no circulation.
Primary Pump Failure
E19
Display shows safety chain / general safety error; unit locked out.
Safety Circuit Interruption
E20
Display shows leak / low water content error; unit will not start.
Water Content / Leak Detection Fault
Symptom
Condensation or water dripping from the flue joints inside the property
Condensate Management / Flue Installation Issue
Symptom
Hot water runs out quickly from a De Dietrich storage water heater
Insufficient Storage Capacity or Recovery
Symptom
Hot water temperature fluctuates, alternating between hot and cold during use.
Temperature Instability / Short Cycling
Symptom
No hot water at all; burner does not start when hot tap is opened.
No Demand Recognition / Flow Detection Failure
Symptom
Water heater does not respond to thermostat or controller settings
Control Interface / Thermostat Communication Issue
Symptom
Water heater emits a burning smell or plastic smell during operation
Overheating Component or Electrical Insulation Smell
Symptom
Water heater emits a whistling or high-pitched noise when running
Flow Restriction or Gas Flow Noise
Symptom
Water heater frequently starts and stops even with small hot water demands
Short Cycling on DHW Demand
Symptom
Water heater is leaking from the bottom of the casing.
Internal Water Leak
Symptom
Water heater is leaking from the safety valve discharge pipe.
Overpressure / Safety Valve Discharge
Symptom
Water heater makes loud banging or knocking noises during operation
Kettling / Boiling in Heat Exchanger
Symptom
Water heater produces very hot water; risk of scalding at taps.
Overheating of Domestic Hot Water
Symptom
Water heater runs, but hot water temperature is too low at all taps.
Insufficient Outlet Temperature
Symptom
Water heater trips the electrical breaker or RCD when it starts
Electrical Short or Earth Leakage
Symptom
Water heater vibrates excessively or rattles when the burner is on
Mechanical Vibration / Mounting Fault
Symptom
Water heater will not power on, display is completely blank
No Electrical Power / Dead Control Panel
Symptom
Water heater’s flue terminal shows signs of soot or black staining
Incomplete Combustion / Sooting
Symptom
Water heater’s pilot (on older models) will not stay lit
Pilot Flame Holding Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Water heater does not start, burner will not ignite, lockout symbol on display
|
Ignition Failure / No Flame Detection | View Details |
| E02 |
Water heater shuts down shortly after ignition, display shows overheat / safety thermostat error
|
Overheat / Safety Thermostat Tripped | View Details |
| E03 |
Water heater attempts to start but shuts down with flue / exhaust error on display
|
Flue Gas / Exhaust System Fault | View Details |
| E04 |
Display shows water pressure / low pressure error, heater will not fire
|
Low System Water Pressure | View Details |
| E05 |
Display shows flow sensor / no circulation error, burner cycles rapidly or shuts down
|
Insufficient Water Flow Through Heat Exchanger | View Details |
| E06 |
Display shows DHW sensor error, water temperature unstable or unit shuts down
|
Domestic Hot Water Temperature Sensor Fault (NTC) | View Details |
| E07 |
Display shows flow/return sensor error; unit may overheat or shut down quickly.
|
Heating Circuit Flow or Return NTC Sensor Fault | View Details |
| E08 |
Display shows fan/air pressure error; burner does not ignite.
|
Combustion Fan or Air Pressure Switch Fault | View Details |
| E09 |
Display shows gas valve/modulation error; burner may light but not modulate correctly.
|
Gas Valve Control or Modulation Fault | View Details |
| E10 |
Display shows flame loss during operation; unit cycles on and off frequently.
|
Flame Instability / Flame Loss | View Details |
| E11 |
Display shows communication error between user interface and main board.
|
Control Board Communication Fault | View Details |
| E12 |
Display shows power supply/low voltage error; unit may reboot intermittently.
|
Mains Supply or Internal Power Fault | View Details |
| E13 |
Display shows condensate/drain error; unit locks out during operation.
|
Condensate Drain Blockage | View Details |
| E14 |
Display shows storage tank sensor error; cylinder temperature reading is incorrect.
|
Storage Cylinder Sensor Fault | View Details |
| E15 |
Display shows anti-legionella/disinfection fault; scheduled high-temperature cycle not completed.
|
Anti-Legionella Cycle Failure | View Details |
| E16 |
Display shows sensor short-circuit error; temperature reading is extremely high.
|
NTC Sensor Short Circuit | View Details |
| E17 |
Display shows sensor open-circuit error, temperature reading extremely low or -40°C.
|
NTC Sensor Open Circuit | View Details |
| E18 |
Display shows pump error; unit overheats or shuts down with no circulation.
|
Primary Pump Failure | View Details |
| E19 |
Display shows safety chain / general safety error; unit locked out.
|
Safety Circuit Interruption | View Details |
| E20 |
Display shows leak / low water content error; unit will not start.
|
Water Content / Leak Detection Fault | View Details |
| – |
Condensation or water dripping from the flue joints inside the property
|
Condensate Management / Flue Installation Issue | View Details |
| – |
Hot water runs out quickly from a De Dietrich storage water heater
|
Insufficient Storage Capacity or Recovery | View Details |
| – |
Hot water temperature fluctuates, alternating between hot and cold during use.
|
Temperature Instability / Short Cycling | View Details |
| – |
No hot water at all; burner does not start when hot tap is opened.
|
No Demand Recognition / Flow Detection Failure | View Details |
| – |
Water heater does not respond to thermostat or controller settings
|
Control Interface / Thermostat Communication Issue | View Details |
| – |
Water heater emits a burning smell or plastic smell during operation
|
Overheating Component or Electrical Insulation Smell | View Details |
| – |
Water heater emits a whistling or high-pitched noise when running
|
Flow Restriction or Gas Flow Noise | View Details |
| – |
Water heater frequently starts and stops even with small hot water demands
|
Short Cycling on DHW Demand | View Details |
| – |
Water heater is leaking from the bottom of the casing.
|
Internal Water Leak | View Details |
| – |
Water heater is leaking from the safety valve discharge pipe.
|
Overpressure / Safety Valve Discharge | View Details |
| – |
Water heater makes loud banging or knocking noises during operation
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Water heater produces very hot water; risk of scalding at taps.
|
Overheating of Domestic Hot Water | View Details |
| – |
Water heater runs, but hot water temperature is too low at all taps.
|
Insufficient Outlet Temperature | View Details |
| – |
Water heater trips the electrical breaker or RCD when it starts
|
Electrical Short or Earth Leakage | View Details |
| – |
Water heater vibrates excessively or rattles when the burner is on
|
Mechanical Vibration / Mounting Fault | View Details |
| – |
Water heater will not power on, display is completely blank
|
No Electrical Power / Dead Control Panel | View Details |
| – |
Water heater’s flue terminal shows signs of soot or black staining
|
Incomplete Combustion / Sooting | View Details |
| – |
Water heater’s pilot (on older models) will not stay lit
|
Pilot Flame Holding Fault | View Details |
No matching codes found
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