American Water Heaters
American Water Heaters Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
E01
Electronic gas water heater will not ignite; display shows E01 and burner never lights.
Ignition Failure Lockout
E02
Electronic gas water heater attempts to light but shuts down with E02; burner lights briefly or not at all.
Flame Detection Failure
E03
Electronic gas water heater shuts down with E03; blower may run but burner does not light.
Pressure Switch or Inducer Fault
E04
Electronic gas water heater displays E04 and shuts down; unit may have overheated or cycled frequently.
High Limit Switch Trip / Overheat Condition
E05
Electronic gas water heater shows E05; unit may not respond to temperature changes or may shut down intermittently.
Tank Temperature Sensor (Thermistor) Fault
E06
Electronic gas water heater displays E06; unit may not power up correctly or may lock out immediately.
Control Board Communication or Internal Fault
E07
Electronic gas water heater shows E07; blower may not start or may run continuously without ignition.
Blower Motor or Blower Feedback Fault
E08
Electronic gas water heater displays E08; unit may shut down shortly after ignition or during operation.
Flue Temperature Sensor / Exhaust Overheat Fault
E09
Electronic gas water heater shows E09; unit may not respond to user inputs or may have erratic display behavior.
User Interface / Keypad Fault
E10
Electronic gas water heater displays E10; unit may not start or may shut down unexpectedly.
Line Voltage or Power Supply Fault
E11
Electronic gas water heater shows E11; burner may shut off before reaching set temperature.
Outlet Temperature Sensor Fault (Dual Sensor Models)
E12
Electronic gas water heater displays E12; unit may short-cycle or fail to maintain temperature.
Inlet Temperature Sensor Fault (Condensing / Advanced Models)
E13
Electronic gas water heater shows E13; unit may not fire or may shut down during operation.
Condensate Drain or Blocked Heat Exchanger (Condensing Models)
E14
Electronic gas water heater displays E14; unit may lock out after several failed ignition attempts.
Gas Valve Modulation / Valve Fault
E15
Electronic gas water heater shows E15; unit may shut down during operation, often in tight mechanical rooms.
Flame Rollout or Combustion Air Fault
E16
Electronic gas water heater displays E16; unit may not start or may shut down with a combustion-related fault.
Combustion Air Proving / Intake Blockage Fault
E17
Electronic gas water heater shows E17; unit may lock out after sensing abnormal flame behavior.
Flame Signal Out of Range / Flame Instability
E18
Electronic gas water heater displays E18; unit may not respond to thermostat changes or may over/under-heat.
Setpoint / Memory Error in Control
E19
Electronic gas water heater shows E19; unit may not fire and may indicate a safety chain fault.
Safety Circuit Open (ECO, Limit, Rollout Chain)
E20
Electronic gas water heater displays E20; unit may not start blower or igniter.
Internal Relay or Output Driver Fault
ELECT_E1
Electric American Water Heaters unit displays E1; no hot water or limited heating.
Upper Thermostat / Control Fault
ELECT_E2
Electric American Water Heaters unit displays E2; water is warm but not hot enough.
Lower Thermostat or Lower Element Fault
ELECT_E3
Electric American Water Heaters unit displays E3; water temperature overshoots setpoint or trips high limit.
Thermostat Stuck Closed / Overheat
ELECT_E4
Electric American Water Heaters unit displays E4; control unresponsive or random error behavior.
Electronic Control Board Fault (Electric / Hybrid Models)
FVS
Flammable vapor ignition resistant (FVIR) gas water heater status light flashes a specific pattern indicating flammable vapor sensor lockout.
Flammable Vapor Sensor (FVS) Lockout
LED_1_FLASH
Gas control status light flashes 1 time repeatedly; water heater will not heat.
Thermopile Low Voltage / Pilot Not Sustained
LED_2_FLASH
Gas control status light flashes 2 times repeatedly; burner will not light.
Pressure Switch or Venting Fault (Power Vent Models with LED Codes)
LED_3_FLASH
Gas control status light flashes 3 times repeatedly; water heater locked out.
Flame Sense Error on Standing Pilot / Electronic Hybrid Models
Symptom
Condensation or water pooling around the base of the water heater during operation.
Condensation vs. Actual Leak
Symptom
Gas water heater burner has yellow, lazy flames or produces soot at the draft hood.
Improper Combustion / Incomplete Burning
Symptom
Gas water heater burner lights but shuts off prematurely; water not reaching set temperature.
Short Cycling / Inadequate Run Time
Symptom
Gas water heater pilot lights but will not stay lit when the gas control knob is released.
Pilot Dropout / Thermocouple or Thermopile Failure
Symptom
Gas water heater will not light; no status light, no pilot flame, no burner operation.
No Ignition / No Pilot
Symptom
Hot water has a rotten egg or sulfur smell.
Odor from Sulfate-Reducing Bacteria / Anode Reaction
Symptom
Rust-colored or discolored hot water from American Water Heaters tank.
Internal Corrosion / Anode Depletion
Symptom
Water heater fan or blower runs continuously even when there is no hot water demand.
Blower Stuck On / Control Relay Stuck
Symptom
Water heater leaks from the drain valve at the bottom of the tank.
Leaking Drain Valve
Symptom
Water heater leaks from the temperature and pressure (T&P) relief valve discharge pipe.
T&P Valve Discharge
Symptom
Water heater leaks from the top around piping connections.
Top Fitting or Nipple Leak
Symptom
Water heater located in attic or closet triggers pan alarm due to water in drain pan.
Slow Leak or Condensate Overflow
Symptom
Water heater makes popping, rumbling, or banging noises during heating.
Sediment Buildup / Boiling Under Sediment
Symptom
Water heater produces no hot water at all (gas or electric models).
Complete Loss of Heating
Symptom
Water heater provides only a small amount of hot water before going cold.
Insufficient Hot Water Capacity / Single Element Operation
Symptom
Water heater relief valve or nearby piping makes a hissing or whistling sound.
Excessive Pressure or Thermal Expansion
Symptom
Water heater trips the household circuit breaker or GFCI.
Electrical Short or Ground Fault (Electric Models)
Symptom
Water heater vibrates excessively or vent rattles during operation.
Combustion or Blower Vibration
Symptom
Water temperature is too hot; risk of scalding at fixtures.
Overheating / Thermostat Out of Calibration
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Electronic gas water heater will not ignite; display shows E01 and burner never lights.
|
Ignition Failure Lockout | View Details |
| E02 |
Electronic gas water heater attempts to light but shuts down with E02; burner lights briefly or not at all.
|
Flame Detection Failure | View Details |
| E03 |
Electronic gas water heater shuts down with E03; blower may run but burner does not light.
|
Pressure Switch or Inducer Fault | View Details |
| E04 |
Electronic gas water heater displays E04 and shuts down; unit may have overheated or cycled frequently.
|
High Limit Switch Trip / Overheat Condition | View Details |
| E05 |
Electronic gas water heater shows E05; unit may not respond to temperature changes or may shut down intermittently.
|
Tank Temperature Sensor (Thermistor) Fault | View Details |
| E06 |
Electronic gas water heater displays E06; unit may not power up correctly or may lock out immediately.
|
Control Board Communication or Internal Fault | View Details |
| E07 |
Electronic gas water heater shows E07; blower may not start or may run continuously without ignition.
|
Blower Motor or Blower Feedback Fault | View Details |
| E08 |
Electronic gas water heater displays E08; unit may shut down shortly after ignition or during operation.
|
Flue Temperature Sensor / Exhaust Overheat Fault | View Details |
| E09 |
Electronic gas water heater shows E09; unit may not respond to user inputs or may have erratic display behavior.
|
User Interface / Keypad Fault | View Details |
| E10 |
Electronic gas water heater displays E10; unit may not start or may shut down unexpectedly.
|
Line Voltage or Power Supply Fault | View Details |
| E11 |
Electronic gas water heater shows E11; burner may shut off before reaching set temperature.
|
Outlet Temperature Sensor Fault (Dual Sensor Models) | View Details |
| E12 |
Electronic gas water heater displays E12; unit may short-cycle or fail to maintain temperature.
|
Inlet Temperature Sensor Fault (Condensing / Advanced Models) | View Details |
| E13 |
Electronic gas water heater shows E13; unit may not fire or may shut down during operation.
|
Condensate Drain or Blocked Heat Exchanger (Condensing Models) | View Details |
| E14 |
Electronic gas water heater displays E14; unit may lock out after several failed ignition attempts.
|
Gas Valve Modulation / Valve Fault | View Details |
| E15 |
Electronic gas water heater shows E15; unit may shut down during operation, often in tight mechanical rooms.
|
Flame Rollout or Combustion Air Fault | View Details |
| E16 |
Electronic gas water heater displays E16; unit may not start or may shut down with a combustion-related fault.
|
Combustion Air Proving / Intake Blockage Fault | View Details |
| E17 |
Electronic gas water heater shows E17; unit may lock out after sensing abnormal flame behavior.
|
Flame Signal Out of Range / Flame Instability | View Details |
| E18 |
Electronic gas water heater displays E18; unit may not respond to thermostat changes or may over/under-heat.
|
Setpoint / Memory Error in Control | View Details |
| E19 |
Electronic gas water heater shows E19; unit may not fire and may indicate a safety chain fault.
|
Safety Circuit Open (ECO, Limit, Rollout Chain) | View Details |
| E20 |
Electronic gas water heater displays E20; unit may not start blower or igniter.
|
Internal Relay or Output Driver Fault | View Details |
| ELECT_E1 |
Electric American Water Heaters unit displays E1; no hot water or limited heating.
|
Upper Thermostat / Control Fault | View Details |
| ELECT_E2 |
Electric American Water Heaters unit displays E2; water is warm but not hot enough.
|
Lower Thermostat or Lower Element Fault | View Details |
| ELECT_E3 |
Electric American Water Heaters unit displays E3; water temperature overshoots setpoint or trips high limit.
|
Thermostat Stuck Closed / Overheat | View Details |
| ELECT_E4 |
Electric American Water Heaters unit displays E4; control unresponsive or random error behavior.
|
Electronic Control Board Fault (Electric / Hybrid Models) | View Details |
| FVS |
Flammable vapor ignition resistant (FVIR) gas water heater status light flashes a specific pattern indicating flammable vapor sensor lockout.
|
Flammable Vapor Sensor (FVS) Lockout | View Details |
| LED_1_FLASH |
Gas control status light flashes 1 time repeatedly; water heater will not heat.
|
Thermopile Low Voltage / Pilot Not Sustained | View Details |
| LED_2_FLASH |
Gas control status light flashes 2 times repeatedly; burner will not light.
|
Pressure Switch or Venting Fault (Power Vent Models with LED Codes) | View Details |
| LED_3_FLASH |
Gas control status light flashes 3 times repeatedly; water heater locked out.
|
Flame Sense Error on Standing Pilot / Electronic Hybrid Models | View Details |
| – |
Condensation or water pooling around the base of the water heater during operation.
|
Condensation vs. Actual Leak | View Details |
| – |
Gas water heater burner has yellow, lazy flames or produces soot at the draft hood.
|
Improper Combustion / Incomplete Burning | View Details |
| – |
Gas water heater burner lights but shuts off prematurely; water not reaching set temperature.
|
Short Cycling / Inadequate Run Time | View Details |
| – |
Gas water heater pilot lights but will not stay lit when the gas control knob is released.
|
Pilot Dropout / Thermocouple or Thermopile Failure | View Details |
| – |
Gas water heater will not light; no status light, no pilot flame, no burner operation.
|
No Ignition / No Pilot | View Details |
| – |
Hot water has a rotten egg or sulfur smell.
|
Odor from Sulfate-Reducing Bacteria / Anode Reaction | View Details |
| – |
Rust-colored or discolored hot water from American Water Heaters tank.
|
Internal Corrosion / Anode Depletion | View Details |
| – |
Water heater fan or blower runs continuously even when there is no hot water demand.
|
Blower Stuck On / Control Relay Stuck | View Details |
| – |
Water heater leaks from the drain valve at the bottom of the tank.
|
Leaking Drain Valve | View Details |
| – |
Water heater leaks from the temperature and pressure (T&P) relief valve discharge pipe.
|
T&P Valve Discharge | View Details |
| – |
Water heater leaks from the top around piping connections.
|
Top Fitting or Nipple Leak | View Details |
| – |
Water heater located in attic or closet triggers pan alarm due to water in drain pan.
|
Slow Leak or Condensate Overflow | View Details |
| – |
Water heater makes popping, rumbling, or banging noises during heating.
|
Sediment Buildup / Boiling Under Sediment | View Details |
| – |
Water heater produces no hot water at all (gas or electric models).
|
Complete Loss of Heating | View Details |
| – |
Water heater provides only a small amount of hot water before going cold.
|
Insufficient Hot Water Capacity / Single Element Operation | View Details |
| – |
Water heater relief valve or nearby piping makes a hissing or whistling sound.
|
Excessive Pressure or Thermal Expansion | View Details |
| – |
Water heater trips the household circuit breaker or GFCI.
|
Electrical Short or Ground Fault (Electric Models) | View Details |
| – |
Water heater vibrates excessively or vent rattles during operation.
|
Combustion or Blower Vibration | View Details |
| – |
Water temperature is too hot; risk of scalding at fixtures.
|
Overheating / Thermostat Out of Calibration | View Details |
No matching codes found
Advertisements