Dimplex
Dimplex 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 will not start; display shows E01 and heating does not engage
Flow Sensor / Flow Switch Fault
E02
Display shows E02 and water heater shuts down shortly after opening a hot tap
Outlet Temperature Sensor (NTC) Fault
E03
Unit displays E03 and does not heat; sometimes trips immediately on power-up
Inlet Temperature Sensor (NTC) Fault
E04
Water heater shows E04 and stops heating; may occur during long draws of hot water
Overheat / Safety Thermostat Trip
E05
Display shows E05; water remains cold or lukewarm
Heating Element Circuit Fault
E06
Unit displays E06 and does not respond to temperature adjustments
User Interface / Keypad Communication Error
E07
E07 displayed; unit attempts to start then shuts down with no hot water
Triac / Power Control Fault
E08
E08 error; water temperature fluctuates or unit cycles rapidly
Temperature Calibration / Sensor Mismatch
E09
E09 displayed; unit does not heat and may show internal fault indicator
Internal Control PCB Fault
E10
E10 error; unit will not start heating when hot tap is opened
Low / No Water Flow Detected
E11
E11 displayed; water heater stops after a few seconds of operation
Dry-Fire / No Water in Heat Exchanger
E12
E12 error; unit intermittently shuts down under high demand
Supply Voltage Out of Range
E13
E13 displayed; unit locks out and will not restart until power is cycled
Earth Leakage / Ground Fault Detected
E14
E14 error; unit fan (on fan-assisted models) does not run and heater shuts down
Fan Motor / Airflow Fault (for fan-assisted Dimplex water heaters)
E15
E15 displayed; unit indicates internal leak or moisture fault
Internal Leak / Drip Tray Sensor Activated
E16
E16 error; unit reports sensor short circuit
Temperature Sensor Short Circuit
E17
E17 error; unit reports sensor open circuit
Temperature Sensor Open Circuit
E18
E18 displayed; unit cycles on and off rapidly and cannot maintain set temperature
Over-Temperature Differential / Control Instability
E19
E19 error; unit indicates a memory or configuration fault.
EEPROM / Configuration Data Error
E20
E20 displayed; unit reports a communication fault with an external controller (if fitted).
External Control / BMS Communication Error
Symptom
Hot water has a strong rotten egg or sulfur smell.
Bacterial Growth / Chemical Reaction in Tank
Symptom
No hot water at all; the unit has power but the water remains cold.
Complete Heating Failure
Symptom
The water heater does not turn on at all; no lights or display.
No Power / Dead Unit
Symptom
The water heater makes loud banging or knocking noises when heating.
Water Hammer / Thermal Expansion Noise
Symptom
The water heater trips the circuit breaker or RCD/GFCI when turned on or when a hot tap is opened.
Electrical Short or Earth Leakage
Symptom
Unit emits a high-pitched whine or buzzing during operation.
Electrical / Mechanical Vibration Noise
Symptom
Water has a metallic or rusty color when using hot water.
Corrosion / Internal Tank or Exchanger Degradation
Symptom
Water heater casing feels excessively hot to the touch.
Insulation / Overheating Issue
Symptom
Water heater does not respond to button presses or temperature adjustments.
Keypad / Control Panel Failure
Symptom
Water heater is leaking from the bottom or around connections.
External Leak / Joint Failure
Symptom
Water heater leaks only when heating or under high temperature.
Thermal Expansion / Temperature-Related Leak
Symptom
Water heater only works when more than one hot tap is open.
Minimum Flow Threshold Too High
Symptom
Water heater operates but display or indicator lights are blank or unreadable.
Display / Indicator Failure
Symptom
Water heater produces steam or very hot water intermittently at outlets.
Dangerous Over-Temperature Condition
Symptom
Water heater randomly resets or turns off and on by itself.
Intermittent Power / Control Reset
Symptom
Water heater turns on and off rapidly (short cycling) without stable operation.
Short Cycling / Control Instability
Symptom
Water is too hot, even at low temperature settings.
Overheating / Temperature Overshoot
Symptom
Water is warm but not hot enough, even at the maximum temperature setting.
Insufficient Heating / Under-Temperature
Symptom
Water temperature fluctuates between hot and cold during a shower.
Temperature Fluctuation / Hunting
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Water heater will not start; display shows E01 and heating does not engage
|
Flow Sensor / Flow Switch Fault | View Details |
| E02 |
Display shows E02 and water heater shuts down shortly after opening a hot tap
|
Outlet Temperature Sensor (NTC) Fault | View Details |
| E03 |
Unit displays E03 and does not heat; sometimes trips immediately on power-up
|
Inlet Temperature Sensor (NTC) Fault | View Details |
| E04 |
Water heater shows E04 and stops heating; may occur during long draws of hot water
|
Overheat / Safety Thermostat Trip | View Details |
| E05 |
Display shows E05; water remains cold or lukewarm
|
Heating Element Circuit Fault | View Details |
| E06 |
Unit displays E06 and does not respond to temperature adjustments
|
User Interface / Keypad Communication Error | View Details |
| E07 |
E07 displayed; unit attempts to start then shuts down with no hot water
|
Triac / Power Control Fault | View Details |
| E08 |
E08 error; water temperature fluctuates or unit cycles rapidly
|
Temperature Calibration / Sensor Mismatch | View Details |
| E09 |
E09 displayed; unit does not heat and may show internal fault indicator
|
Internal Control PCB Fault | View Details |
| E10 |
E10 error; unit will not start heating when hot tap is opened
|
Low / No Water Flow Detected | View Details |
| E11 |
E11 displayed; water heater stops after a few seconds of operation
|
Dry-Fire / No Water in Heat Exchanger | View Details |
| E12 |
E12 error; unit intermittently shuts down under high demand
|
Supply Voltage Out of Range | View Details |
| E13 |
E13 displayed; unit locks out and will not restart until power is cycled
|
Earth Leakage / Ground Fault Detected | View Details |
| E14 |
E14 error; unit fan (on fan-assisted models) does not run and heater shuts down
|
Fan Motor / Airflow Fault (for fan-assisted Dimplex water heaters) | View Details |
| E15 |
E15 displayed; unit indicates internal leak or moisture fault
|
Internal Leak / Drip Tray Sensor Activated | View Details |
| E16 |
E16 error; unit reports sensor short circuit
|
Temperature Sensor Short Circuit | View Details |
| E17 |
E17 error; unit reports sensor open circuit
|
Temperature Sensor Open Circuit | View Details |
| E18 |
E18 displayed; unit cycles on and off rapidly and cannot maintain set temperature
|
Over-Temperature Differential / Control Instability | View Details |
| E19 |
E19 error; unit indicates a memory or configuration fault.
|
EEPROM / Configuration Data Error | View Details |
| E20 |
E20 displayed; unit reports a communication fault with an external controller (if fitted).
|
External Control / BMS Communication Error | View Details |
| – |
Hot water has a strong rotten egg or sulfur smell.
|
Bacterial Growth / Chemical Reaction in Tank | View Details |
| – |
No hot water at all; the unit has power but the water remains cold.
|
Complete Heating Failure | View Details |
| – |
The water heater does not turn on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
The water heater makes loud banging or knocking noises when heating.
|
Water Hammer / Thermal Expansion Noise | View Details |
| – |
The water heater trips the circuit breaker or RCD/GFCI when turned on or when a hot tap is opened.
|
Electrical Short or Earth Leakage | View Details |
| – |
Unit emits a high-pitched whine or buzzing during operation.
|
Electrical / Mechanical Vibration Noise | View Details |
| – |
Water has a metallic or rusty color when using hot water.
|
Corrosion / Internal Tank or Exchanger Degradation | View Details |
| – |
Water heater casing feels excessively hot to the touch.
|
Insulation / Overheating Issue | View Details |
| – |
Water heater does not respond to button presses or temperature adjustments.
|
Keypad / Control Panel Failure | View Details |
| – |
Water heater is leaking from the bottom or around connections.
|
External Leak / Joint Failure | View Details |
| – |
Water heater leaks only when heating or under high temperature.
|
Thermal Expansion / Temperature-Related Leak | View Details |
| – |
Water heater only works when more than one hot tap is open.
|
Minimum Flow Threshold Too High | View Details |
| – |
Water heater operates but display or indicator lights are blank or unreadable.
|
Display / Indicator Failure | View Details |
| – |
Water heater produces steam or very hot water intermittently at outlets.
|
Dangerous Over-Temperature Condition | View Details |
| – |
Water heater randomly resets or turns off and on by itself.
|
Intermittent Power / Control Reset | View Details |
| – |
Water heater turns on and off rapidly (short cycling) without stable operation.
|
Short Cycling / Control Instability | View Details |
| – |
Water is too hot, even at low temperature settings.
|
Overheating / Temperature Overshoot | View Details |
| – |
Water is warm but not hot enough, even at the maximum temperature setting.
|
Insufficient Heating / Under-Temperature | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower.
|
Temperature Fluctuation / Hunting | View Details |
No matching codes found
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