Chaffoteaux 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 ignite, burner never lights, display shows E01 shortly after a hot water demand.
Ignition Failure / No Flame Detection
E02
Water heater locks out with E02, fan may start but burner does not light or shuts down quickly.
Flame Loss During Operation
E03
Display shows E03 and the water heater shuts down; fan may not start or stops quickly.
Flue Gas Safety / Overheat / Flue Thermostat Trip (model-dependent)
E04
Unit displays E04 and will not start; often associated with overheating or safety thermostat trip.
Primary Circuit Overheat / Safety Thermostat Activated
E05
Display shows E05, burner does not light or shuts down; often related to temperature sensor issues.
DHW NTC Sensor Fault (Open or Short Circuit)
E06
E06 appears on the display, water temperature is erratic or unit shuts down.
Primary Flow NTC Sensor Fault
E07
E07 error, fan may run but ignition does not occur; sometimes accompanied by flue-related warnings.
Air Pressure Switch / Fan Proving Fault
E08
E08 displayed, unit may attempt to start but shuts down quickly; often linked to fan or flue issues.
Fan Speed / Fan Feedback Fault
E09
E09 error, water heater does not operate; may be associated with internal communication issues.
PCB / Internal Communication Fault
E10
E10 displayed, unit refuses to start; often related to water pressure or flow issues.
Insufficient Water Flow / Flow Sensor Fault
E11
E11 error, unit may start then shut down; sometimes linked to gas valve control.
Gas Valve Control / Modulation Fault
E12
E12 shown on display, often after power disturbances; unit may not respond to controls.
EEPROM / Configuration Data Error
E13
E13 error, unit may overheat quickly or show incorrect temperatures.
NTC Sensor Calibration / Temperature Differential Fault
E14
E14 displayed, often associated with flue gas temperature sensor issues on condensing models.
Flue Gas NTC Sensor Fault
E15
E15 error, unit may not start or may shut down during operation; sometimes linked to ionization current.
Low Flame Ionization Signal
E16
E16 displayed, often associated with overtemperature in condensing section or return line.
Return Temperature Overheat / Condenser Overheat
E20
E20 error, unit may not respond to user inputs or external controls.
Communication Fault with Remote Control / User Interface
E25
E25 displayed, water temperature fluctuates or is limited.
DHW Temperature Regulation Fault
E30
E30 error, often associated with condensate or flue system problems on condensing models.
Condensate Drain / Flue System Fault
E40
E40 displayed, unit may not start; often linked to gas type or configuration mismatch.
Gas Type / Configuration Error
E50
E50 error, unit may lock out; often related to safety chain or multiple sensor faults.
General Safety Chain Fault
Symptom
Display or indicator lights flicker or reset when the burner ignites.
Voltage Drop / Electrical Interference
Symptom
Hot water output stops after a few minutes, then returns after a short wait.
Thermal Cut-Out / Overheat Cycling
Symptom
Smell of burning plastic or electrical smell from the water heater.
Overheating Electrical Component
Symptom
Smell of gas near the water heater, especially when it is operating.
Gas Leak at Appliance
Symptom
Water heater display works but buttons or knobs do not respond.
User Interface Failure
Symptom
Water heater does not start at all, no lights or display, completely dead.
No Power Supply / Electrical Input Failure
Symptom
Water heater drips from the flue or condensate pipe.
Condensate Management Issue
Symptom
Water heater emits a whistling or high-pitched noise when running.
Flow-Induced Noise / Gas Flow Noise
Symptom
Water heater fan runs but burner does not ignite, and no error code is shown.
Ignition Sequence Interruption
Symptom
Water heater frequently shuts down and restarts while using hot water, without showing an error code.
Short Cycling
Symptom
Water heater has power but does not ignite when a hot water tap is opened; no error code displayed.
Flow Detection Failure Without Code
Symptom
Water heater ignites but hot water temperature is too low even at maximum setting.
Insufficient Heating / Underfiring
Symptom
Water heater ignites but shuts off when the hot tap is partially closed (low flow).
Low Flow Extinguishing
Symptom
Water heater is leaking water from the bottom of the casing.
Internal Water Leak
Symptom
Water heater makes loud banging or popping noises during operation.
Kettling / Boiling in Heat Exchanger
Symptom
Water heater only ignites when multiple hot taps are opened, not with a single tap.
High Minimum Flow Threshold
Symptom
Water heater produces water that is too hot, even at low temperature settings.
Overheating / Poor Temperature Regulation
Symptom
Water heater vibrates excessively or rattles when the fan runs.
Mechanical Vibration / Fan Imbalance
Symptom
Water temperature fluctuates between hot and cold during a shower.
Intermittent Heating / Cycling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Water heater does not ignite, burner never lights, display shows E01 shortly after a hot water demand.
|
Ignition Failure / No Flame Detection | View Details |
| E02 |
Water heater locks out with E02, fan may start but burner does not light or shuts down quickly.
|
Flame Loss During Operation | View Details |
| E03 |
Display shows E03 and the water heater shuts down; fan may not start or stops quickly.
|
Flue Gas Safety / Overheat / Flue Thermostat Trip (model-dependent) | View Details |
| E04 |
Unit displays E04 and will not start; often associated with overheating or safety thermostat trip.
|
Primary Circuit Overheat / Safety Thermostat Activated | View Details |
| E05 |
Display shows E05, burner does not light or shuts down; often related to temperature sensor issues.
|
DHW NTC Sensor Fault (Open or Short Circuit) | View Details |
| E06 |
E06 appears on the display, water temperature is erratic or unit shuts down.
|
Primary Flow NTC Sensor Fault | View Details |
| E07 |
E07 error, fan may run but ignition does not occur; sometimes accompanied by flue-related warnings.
|
Air Pressure Switch / Fan Proving Fault | View Details |
| E08 |
E08 displayed, unit may attempt to start but shuts down quickly; often linked to fan or flue issues.
|
Fan Speed / Fan Feedback Fault | View Details |
| E09 |
E09 error, water heater does not operate; may be associated with internal communication issues.
|
PCB / Internal Communication Fault | View Details |
| E10 |
E10 displayed, unit refuses to start; often related to water pressure or flow issues.
|
Insufficient Water Flow / Flow Sensor Fault | View Details |
| E11 |
E11 error, unit may start then shut down; sometimes linked to gas valve control.
|
Gas Valve Control / Modulation Fault | View Details |
| E12 |
E12 shown on display, often after power disturbances; unit may not respond to controls.
|
EEPROM / Configuration Data Error | View Details |
| E13 |
E13 error, unit may overheat quickly or show incorrect temperatures.
|
NTC Sensor Calibration / Temperature Differential Fault | View Details |
| E14 |
E14 displayed, often associated with flue gas temperature sensor issues on condensing models.
|
Flue Gas NTC Sensor Fault | View Details |
| E15 |
E15 error, unit may not start or may shut down during operation; sometimes linked to ionization current.
|
Low Flame Ionization Signal | View Details |
| E16 |
E16 displayed, often associated with overtemperature in condensing section or return line.
|
Return Temperature Overheat / Condenser Overheat | View Details |
| E20 |
E20 error, unit may not respond to user inputs or external controls.
|
Communication Fault with Remote Control / User Interface | View Details |
| E25 |
E25 displayed, water temperature fluctuates or is limited.
|
DHW Temperature Regulation Fault | View Details |
| E30 |
E30 error, often associated with condensate or flue system problems on condensing models.
|
Condensate Drain / Flue System Fault | View Details |
| E40 |
E40 displayed, unit may not start; often linked to gas type or configuration mismatch.
|
Gas Type / Configuration Error | View Details |
| E50 |
E50 error, unit may lock out; often related to safety chain or multiple sensor faults.
|
General Safety Chain Fault | View Details |
| – |
Display or indicator lights flicker or reset when the burner ignites.
|
Voltage Drop / Electrical Interference | View Details |
| – |
Hot water output stops after a few minutes, then returns after a short wait.
|
Thermal Cut-Out / Overheat Cycling | View Details |
| – |
Smell of burning plastic or electrical smell from the water heater.
|
Overheating Electrical Component | View Details |
| – |
Smell of gas near the water heater, especially when it is operating.
|
Gas Leak at Appliance | View Details |
| – |
Water heater display works but buttons or knobs do not respond.
|
User Interface Failure | View Details |
| – |
Water heater does not start at all, no lights or display, completely dead.
|
No Power Supply / Electrical Input Failure | View Details |
| – |
Water heater drips from the flue or condensate pipe.
|
Condensate Management Issue | View Details |
| – |
Water heater emits a whistling or high-pitched noise when running.
|
Flow-Induced Noise / Gas Flow Noise | View Details |
| – |
Water heater fan runs but burner does not ignite, and no error code is shown.
|
Ignition Sequence Interruption | View Details |
| – |
Water heater frequently shuts down and restarts while using hot water, without showing an error code.
|
Short Cycling | View Details |
| – |
Water heater has power but does not ignite when a hot water tap is opened; no error code displayed.
|
Flow Detection Failure Without Code | View Details |
| – |
Water heater ignites but hot water temperature is too low even at maximum setting.
|
Insufficient Heating / Underfiring | View Details |
| – |
Water heater ignites but shuts off when the hot tap is partially closed (low flow).
|
Low Flow Extinguishing | View Details |
| – |
Water heater is leaking water from the bottom of the casing.
|
Internal Water Leak | View Details |
| – |
Water heater makes loud banging or popping noises during operation.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Water heater only ignites when multiple hot taps are opened, not with a single tap.
|
High Minimum Flow Threshold | View Details |
| – |
Water heater produces water that is too hot, even at low temperature settings.
|
Overheating / Poor Temperature Regulation | View Details |
| – |
Water heater vibrates excessively or rattles when the fan runs.
|
Mechanical Vibration / Fan Imbalance | View Details |
| – |
Water temperature fluctuates between hot and cold during a shower.
|
Intermittent Heating / Cycling | View Details |
No matching codes found
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