Stiebel Eltron
Stiebel Eltron 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
Stiebel Eltron electronic tankless water heater will not heat; display shows E01 and unit does not activate when hot water tap is opened.
Flow Sensor / Flow Switch Fault
E02
Display shows E02 and water heater does not heat or shuts down shortly after opening a hot water tap.
Outlet Temperature Sensor (NTC) Fault
E03
Stiebel Eltron tankless heater shows E03 and shuts down; water may briefly get hot then unit stops.
Inlet Temperature Sensor (NTC) Fault
E04
Display shows E04 and heater does not produce hot water or shuts down quickly.
Safety Temperature Limiter / Thermal Cutout Tripped or Faulty
E05
Heater shows E05 and does not heat; sometimes accompanied by clicking relays but no power to heating elements.
Heating Element Circuit Fault
E06
Display shows E06 and unit shuts down; may occur during operation when water temperature fluctuates.
Temperature Sensor Mismatch / Differential Error
E07
Stiebel Eltron heater displays E07 and will not start heating; sometimes occurs after power surge or lightning event.
Control Board / Electronics Fault
E08
Display shows E08 and heater does not heat; may be associated with very low or no water flow.
Minimum Flow Not Reached / Flow Too Low
E09
Heater shows E09 and shuts down; may occur when set temperature is high and flow is low.
Overtemperature / Overheating Protection
E10
Display shows E10 and unit will not operate; may appear after wiring changes or installation.
Supply Voltage / Phase Configuration Error
E11
Stiebel Eltron heater shows E11 and does not heat; may be intermittent.
Communication Error Between Display Module and Main Board
E12
Display shows E12 and heater will not start; often associated with internal leak or condensation.
Internal Leak / Moisture Detection
E13
Heater shows E13 and shuts down; may be associated with very high inlet temperature or recirculation systems.
Inlet Temperature Too High
E14
Display shows E14 and unit does not heat; may occur on models with electronic air detection or pressure monitoring.
Air in System / Pressure Sensor Fault
E15
Stiebel Eltron heater shows E15 and shuts down; may be associated with ground fault or insulation issues.
Earth Leakage / Ground Fault Detection
E16
Display shows E16 and heater does not respond to user input or temperature changes.
User Interface / Keypad Fault
E17
Heater shows E17 and may continue operating at reduced performance or shut down intermittently.
Power Derating / Overcurrent Protection
E18
Display shows E18 and unit does not heat; often appears on models with external temperature sensors or remote controls.
External Sensor / Remote Control Fault
Symptom
Display is blank or does not power on, but supply voltage is present at the unit.
No Display / No Power to Control Electronics
Symptom
Display is on but unresponsive to button presses or rotary knob adjustments.
Frozen User Interface
Symptom
Unit trips the circuit breaker or RCD/GFCI when hot water is used.
Electrical Short or Ground Fault Under Load
Symptom
Water heater emits a burning smell or visible smoke during operation.
Overheating Electrical Component
Symptom
Water heater installed in a cold area occasionally freezes or shows signs of frost damage (cracked components).
Freeze Damage / Inadequate Frost Protection
Symptom
Water heater is installed but produces hot water only at some fixtures, while others remain cold.
Partial Supply / Plumbing Distribution Issue
Symptom
Water heater is leaking from the bottom or inside the casing.
Internal Water Leak
Symptom
Water heater is very hot to the touch on the casing or surrounding area during normal operation.
Excessive Surface Temperature / Poor Ventilation
Symptom
Water heater makes loud clicking, buzzing, or humming noises during operation.
Mechanical / Electrical Noise During Heating
Symptom
Water heater occasionally fails to start when a tap is opened, but works again after closing and reopening the tap.
Intermittent Activation Failure
Symptom
Water heater operates but causes noticeable water hammer or banging noises in the plumbing when turning on or off.
Hydraulic Shock / Water Hammer
Symptom
Water heater performance has gradually declined over months or years; longer time to get hot water and lower maximum temperature.
Progressive Scale Buildup / Efficiency Loss
Symptom
Water heater produces no hot water at any tap; display appears normal and no error code is shown.
No Heating with Normal Display
Symptom
Water heater runs continuously and does not shut off when hot water taps are closed.
Flow Detection Stuck On
Symptom
Water heater turns on and off rapidly when a small amount of hot water is drawn (short cycling).
Short Cycling at Low Flow
Symptom
Water is only lukewarm even when the temperature is set to maximum and flow is moderate.
Insufficient Heating / Under-Temperature
Symptom
Water is scalding hot even at low temperature settings; small adjustments on the control cause large temperature changes.
Overheating / Poor Temperature Regulation
Symptom
Water temperature fluctuates between hot and cold during a shower without any error code on the display.
Temperature Fluctuation / Hunting
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Stiebel Eltron electronic tankless water heater will not heat; display shows E01 and unit does not activate when hot water tap is opened.
|
Flow Sensor / Flow Switch Fault | View Details |
| E02 |
Display shows E02 and water heater does not heat or shuts down shortly after opening a hot water tap.
|
Outlet Temperature Sensor (NTC) Fault | View Details |
| E03 |
Stiebel Eltron tankless heater shows E03 and shuts down; water may briefly get hot then unit stops.
|
Inlet Temperature Sensor (NTC) Fault | View Details |
| E04 |
Display shows E04 and heater does not produce hot water or shuts down quickly.
|
Safety Temperature Limiter / Thermal Cutout Tripped or Faulty | View Details |
| E05 |
Heater shows E05 and does not heat; sometimes accompanied by clicking relays but no power to heating elements.
|
Heating Element Circuit Fault | View Details |
| E06 |
Display shows E06 and unit shuts down; may occur during operation when water temperature fluctuates.
|
Temperature Sensor Mismatch / Differential Error | View Details |
| E07 |
Stiebel Eltron heater displays E07 and will not start heating; sometimes occurs after power surge or lightning event.
|
Control Board / Electronics Fault | View Details |
| E08 |
Display shows E08 and heater does not heat; may be associated with very low or no water flow.
|
Minimum Flow Not Reached / Flow Too Low | View Details |
| E09 |
Heater shows E09 and shuts down; may occur when set temperature is high and flow is low.
|
Overtemperature / Overheating Protection | View Details |
| E10 |
Display shows E10 and unit will not operate; may appear after wiring changes or installation.
|
Supply Voltage / Phase Configuration Error | View Details |
| E11 |
Stiebel Eltron heater shows E11 and does not heat; may be intermittent.
|
Communication Error Between Display Module and Main Board | View Details |
| E12 |
Display shows E12 and heater will not start; often associated with internal leak or condensation.
|
Internal Leak / Moisture Detection | View Details |
| E13 |
Heater shows E13 and shuts down; may be associated with very high inlet temperature or recirculation systems.
|
Inlet Temperature Too High | View Details |
| E14 |
Display shows E14 and unit does not heat; may occur on models with electronic air detection or pressure monitoring.
|
Air in System / Pressure Sensor Fault | View Details |
| E15 |
Stiebel Eltron heater shows E15 and shuts down; may be associated with ground fault or insulation issues.
|
Earth Leakage / Ground Fault Detection | View Details |
| E16 |
Display shows E16 and heater does not respond to user input or temperature changes.
|
User Interface / Keypad Fault | View Details |
| E17 |
Heater shows E17 and may continue operating at reduced performance or shut down intermittently.
|
Power Derating / Overcurrent Protection | View Details |
| E18 |
Display shows E18 and unit does not heat; often appears on models with external temperature sensors or remote controls.
|
External Sensor / Remote Control Fault | View Details |
| – |
Display is blank or does not power on, but supply voltage is present at the unit.
|
No Display / No Power to Control Electronics | View Details |
| – |
Display is on but unresponsive to button presses or rotary knob adjustments.
|
Frozen User Interface | View Details |
| – |
Unit trips the circuit breaker or RCD/GFCI when hot water is used.
|
Electrical Short or Ground Fault Under Load | View Details |
| – |
Water heater emits a burning smell or visible smoke during operation.
|
Overheating Electrical Component | View Details |
| – |
Water heater installed in a cold area occasionally freezes or shows signs of frost damage (cracked components).
|
Freeze Damage / Inadequate Frost Protection | View Details |
| – |
Water heater is installed but produces hot water only at some fixtures, while others remain cold.
|
Partial Supply / Plumbing Distribution Issue | View Details |
| – |
Water heater is leaking from the bottom or inside the casing.
|
Internal Water Leak | View Details |
| – |
Water heater is very hot to the touch on the casing or surrounding area during normal operation.
|
Excessive Surface Temperature / Poor Ventilation | View Details |
| – |
Water heater makes loud clicking, buzzing, or humming noises during operation.
|
Mechanical / Electrical Noise During Heating | View Details |
| – |
Water heater occasionally fails to start when a tap is opened, but works again after closing and reopening the tap.
|
Intermittent Activation Failure | View Details |
| – |
Water heater operates but causes noticeable water hammer or banging noises in the plumbing when turning on or off.
|
Hydraulic Shock / Water Hammer | View Details |
| – |
Water heater performance has gradually declined over months or years; longer time to get hot water and lower maximum temperature.
|
Progressive Scale Buildup / Efficiency Loss | View Details |
| – |
Water heater produces no hot water at any tap; display appears normal and no error code is shown.
|
No Heating with Normal Display | View Details |
| – |
Water heater runs continuously and does not shut off when hot water taps are closed.
|
Flow Detection Stuck On | View Details |
| – |
Water heater turns on and off rapidly when a small amount of hot water is drawn (short cycling).
|
Short Cycling at Low Flow | View Details |
| – |
Water is only lukewarm even when the temperature is set to maximum and flow is moderate.
|
Insufficient Heating / Under-Temperature | View Details |
| – |
Water is scalding hot even at low temperature settings; small adjustments on the control cause large temperature changes.
|
Overheating / Poor Temperature Regulation | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower without any error code on the display.
|
Temperature Fluctuation / Hunting | View Details |
No matching codes found
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