State
State 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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E0
State electronic gas tank-type water heater LED flashes E0 or similar code; unit will not light.
Gas Control Valve / Thermostat Failure
E01
State gas tankless water heater will not ignite; display shows E01 shortly after a hot water tap is opened.
Ignition Failure
E02
State tankless water heater shuts down with E02 shortly after ignition; burner lights briefly then goes out.
Flame Loss / Flame Detection Failure
E03
State tankless water heater displays E03 and shuts down; fan may start but burner does not light.
Exhaust or Intake Air Blockage
E04
State tankless water heater shows E04 and shuts down; unit may overheat or water is extremely hot before shutdown.
High Limit / Overheat Protection Trip
E05
State tankless water heater displays E05 and will not run; occurs immediately when a hot water tap is opened.
Inlet Temperature Sensor (Thermistor) Fault
E06
State tankless water heater shows E06; water temperature fluctuates or unit shuts down.
Outlet Temperature Sensor (Thermistor) Fault
E07
State tankless water heater displays E07 and will not fire; fan may not start.
Combustion Fan / Blower Failure
E08
State tankless water heater shows E08; unit may start then shut down quickly.
Gas Valve / Gas Control Fault
E09
State tankless water heater displays E09; unit may not detect water flow or may shut off unexpectedly.
Flow Sensor / Turbine Fault
E1
State electronic gas tank-type water heater LED flashes E1; pilot will not stay lit or main burner will not light.
Ignition / Flame Sense Failure (Tank-Type)
E10
State tankless water heater shows E10; unit may lock out and require reset.
High Exhaust Temperature / Flue Overheat
E11
State tankless water heater displays E11; unit may not respond to temperature adjustments.
User Interface / Remote Control Communication Error
E12
State tankless water heater shows E12; unit may operate intermittently or lock out.
Control Board Internal Error
E13
State tankless water heater displays E13; water temperature may be unstable.
Recirculation / Return Temperature Sensor Fault (if equipped)
E14
State tankless water heater shows E14; unit may not modulate properly.
Fan Speed / Tachometer Signal Error
E15
State tankless water heater displays E15; unit may not start or may shut down unexpectedly.
Power Supply / Low Voltage Error
E16
State tankless water heater shows E16; unit may overheat at low flow conditions.
Minimum Flow / Overheat at Low Flow
E17
State tankless water heater displays E17; unit may not recognize recirculation demand.
Recirculation Pump Control Error (internal or external pump models)
E18
State tankless water heater shows E18; unit may lock out during very cold inlet conditions.
Freeze Protection / Low Ambient Temperature Error
E19
State tankless water heater displays E19; unit may not respond to external demand signal.
External Control / BMS Communication Error
E2
State electronic gas tank-type water heater LED flashes E2; water temperature may be erratic or unit shuts down.
Temperature Sensor (Thermistor) Error in Gas Control
E3
State electronic gas tank-type water heater LED flashes E3; unit may overheat or shut down.
High Limit / ECO (Energy Cut Off) Trip
E4
State electronic gas tank-type water heater LED flashes E4; unit may not respond to commands.
Control Board / Gas Valve Internal Error
E5
State electronic gas tank-type water heater LED flashes E5; unit may not light or may shut down.
Pressure Switch / Draft Inducer Error (Power Vent Models)
E6
State electronic gas tank-type water heater LED flashes E6; unit may not power the blower.
Blower Motor / Power Vent Failure
E7
State electronic gas tank-type water heater LED flashes E7; unit may not detect flame correctly.
Flame Sense Error (Power Vent Models)
E8
State electronic gas tank-type water heater LED flashes E8; unit may overheat or shut down.
Outlet Temperature Sensor Error (Power Vent Models)
E9
State electronic gas tank-type water heater LED flashes E9; unit may not operate.
Communication Error Between Gas Control and Blower/Interface
F01
State electric water heater with electronic control displays F01; no hot water or limited hot water.
Upper Thermostat / Control Failure
F02
State electric water heater displays F02; water may be too hot or not hot enough.
Temperature Sensor / Thermistor Error (Electric)
F03
State electric water heater displays F03; lower element may not heat.
Lower Element / Thermostat Fault
F04
State electric water heater displays F04; unit may trip breaker or not heat.
Dry Fire / Element Overheat Detection
F05
State electric water heater displays F05; control may be unresponsive.
Control Board Internal Error (Electric)
FV
State FVIR (flammable vapor ignition resistant) gas tank-type water heater status light flashes a flammable vapor (FV) error code; burner will not light.
Flammable Vapor Sensor Lockout
Symptom
State electric water heater: no hot water at all; no electronic display or codes.
No Power / Open Circuit
Symptom
State electric water heater: some hot water but runs out quickly.
Lower Element Not Heating
Symptom
State gas tank-type water heater: burner does not light, status light indicates normal pilot but no main burner.
Main Burner Ignition Failure
Symptom
State gas tank-type water heater: no hot water, pilot will not light or stay lit; no digital error code present.
Pilot Ignition Failure (Standing Pilot or Piezo Ignition)
Symptom
State gas water heater: burner has yellow, lazy flames and produces soot.
Incomplete Combustion / Improper Air-Fuel Mixture
Symptom
State power vent gas water heater: strong exhaust smell or flue gases in the room.
Vent System Leakage / Backdrafting
Symptom
State tankless water heater: hot water temperature fluctuates between hot and cold during a shower.
Temperature Fluctuation / Cold Water Sandwich
Symptom
State tankless water heater: unit makes loud vibrating or rattling noise when running.
Vibration / Mounting or Fan Imbalance
Symptom
State water heater (gas or electric): water is too hot at fixtures.
Overheating / Thermostat Out of Calibration
Symptom
State water heater: condensation or water pooling on top of the heater shortly after startup.
Condensation / Minor Top Leak
Symptom
State water heater: frequent clicking or cycling on and off with small temperature changes.
Short Cycling / Oversensitive Control
Symptom
State water heater: hot water runs out faster than it used to.
Reduced Effective Capacity
Symptom
State water heater: low hot water pressure or flow compared to cold.
Hot Side Flow Restriction
Symptom
State water heater: metallic or rusty colored hot water.
Internal Corrosion / Rust Contamination
Symptom
State water heater: rotten egg or sulfur smell in hot water only.
Hydrogen Sulfide Odor from Anode Reaction
Symptom
State water heater: rumbling, popping, or banging noises during heating.
Sediment Boiling / Scale Noise
Symptom
State water heater: water leaking from drain valve at bottom of tank.
Leaking Drain Valve
Symptom
State water heater: water leaking from the bottom of the tank.
Tank Leakage / Inner Tank Failure
Symptom
State water heater: water leaking from the temperature and pressure (T&P) relief valve discharge pipe.
T&P Valve Discharge
Symptom
State water heater: water not hot enough or lukewarm.
Underheating / Insufficient Recovery
Symptom
State water heater: whistling or high-pitched noise when hot water is running.
Flow Restriction / Partially Closed Valve
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
State electronic gas tank-type water heater LED flashes E0 or similar code; unit will not light.
|
Gas Control Valve / Thermostat Failure | View Details |
| E01 |
State gas tankless water heater will not ignite; display shows E01 shortly after a hot water tap is opened.
|
Ignition Failure | View Details |
| E02 |
State tankless water heater shuts down with E02 shortly after ignition; burner lights briefly then goes out.
|
Flame Loss / Flame Detection Failure | View Details |
| E03 |
State tankless water heater displays E03 and shuts down; fan may start but burner does not light.
|
Exhaust or Intake Air Blockage | View Details |
| E04 |
State tankless water heater shows E04 and shuts down; unit may overheat or water is extremely hot before shutdown.
|
High Limit / Overheat Protection Trip | View Details |
| E05 |
State tankless water heater displays E05 and will not run; occurs immediately when a hot water tap is opened.
|
Inlet Temperature Sensor (Thermistor) Fault | View Details |
| E06 |
State tankless water heater shows E06; water temperature fluctuates or unit shuts down.
|
Outlet Temperature Sensor (Thermistor) Fault | View Details |
| E07 |
State tankless water heater displays E07 and will not fire; fan may not start.
|
Combustion Fan / Blower Failure | View Details |
| E08 |
State tankless water heater shows E08; unit may start then shut down quickly.
|
Gas Valve / Gas Control Fault | View Details |
| E09 |
State tankless water heater displays E09; unit may not detect water flow or may shut off unexpectedly.
|
Flow Sensor / Turbine Fault | View Details |
| E1 |
State electronic gas tank-type water heater LED flashes E1; pilot will not stay lit or main burner will not light.
|
Ignition / Flame Sense Failure (Tank-Type) | View Details |
| E10 |
State tankless water heater shows E10; unit may lock out and require reset.
|
High Exhaust Temperature / Flue Overheat | View Details |
| E11 |
State tankless water heater displays E11; unit may not respond to temperature adjustments.
|
User Interface / Remote Control Communication Error | View Details |
| E12 |
State tankless water heater shows E12; unit may operate intermittently or lock out.
|
Control Board Internal Error | View Details |
| E13 |
State tankless water heater displays E13; water temperature may be unstable.
|
Recirculation / Return Temperature Sensor Fault (if equipped) | View Details |
| E14 |
State tankless water heater shows E14; unit may not modulate properly.
|
Fan Speed / Tachometer Signal Error | View Details |
| E15 |
State tankless water heater displays E15; unit may not start or may shut down unexpectedly.
|
Power Supply / Low Voltage Error | View Details |
| E16 |
State tankless water heater shows E16; unit may overheat at low flow conditions.
|
Minimum Flow / Overheat at Low Flow | View Details |
| E17 |
State tankless water heater displays E17; unit may not recognize recirculation demand.
|
Recirculation Pump Control Error (internal or external pump models) | View Details |
| E18 |
State tankless water heater shows E18; unit may lock out during very cold inlet conditions.
|
Freeze Protection / Low Ambient Temperature Error | View Details |
| E19 |
State tankless water heater displays E19; unit may not respond to external demand signal.
|
External Control / BMS Communication Error | View Details |
| E2 |
State electronic gas tank-type water heater LED flashes E2; water temperature may be erratic or unit shuts down.
|
Temperature Sensor (Thermistor) Error in Gas Control | View Details |
| E3 |
State electronic gas tank-type water heater LED flashes E3; unit may overheat or shut down.
|
High Limit / ECO (Energy Cut Off) Trip | View Details |
| E4 |
State electronic gas tank-type water heater LED flashes E4; unit may not respond to commands.
|
Control Board / Gas Valve Internal Error | View Details |
| E5 |
State electronic gas tank-type water heater LED flashes E5; unit may not light or may shut down.
|
Pressure Switch / Draft Inducer Error (Power Vent Models) | View Details |
| E6 |
State electronic gas tank-type water heater LED flashes E6; unit may not power the blower.
|
Blower Motor / Power Vent Failure | View Details |
| E7 |
State electronic gas tank-type water heater LED flashes E7; unit may not detect flame correctly.
|
Flame Sense Error (Power Vent Models) | View Details |
| E8 |
State electronic gas tank-type water heater LED flashes E8; unit may overheat or shut down.
|
Outlet Temperature Sensor Error (Power Vent Models) | View Details |
| E9 |
State electronic gas tank-type water heater LED flashes E9; unit may not operate.
|
Communication Error Between Gas Control and Blower/Interface | View Details |
| F01 |
State electric water heater with electronic control displays F01; no hot water or limited hot water.
|
Upper Thermostat / Control Failure | View Details |
| F02 |
State electric water heater displays F02; water may be too hot or not hot enough.
|
Temperature Sensor / Thermistor Error (Electric) | View Details |
| F03 |
State electric water heater displays F03; lower element may not heat.
|
Lower Element / Thermostat Fault | View Details |
| F04 |
State electric water heater displays F04; unit may trip breaker or not heat.
|
Dry Fire / Element Overheat Detection | View Details |
| F05 |
State electric water heater displays F05; control may be unresponsive.
|
Control Board Internal Error (Electric) | View Details |
| FV |
State FVIR (flammable vapor ignition resistant) gas tank-type water heater status light flashes a flammable vapor (FV) error code; burner will not light.
|
Flammable Vapor Sensor Lockout | View Details |
| – |
State electric water heater: no hot water at all; no electronic display or codes.
|
No Power / Open Circuit | View Details |
| – |
State electric water heater: some hot water but runs out quickly.
|
Lower Element Not Heating | View Details |
| – |
State gas tank-type water heater: burner does not light, status light indicates normal pilot but no main burner.
|
Main Burner Ignition Failure | View Details |
| – |
State gas tank-type water heater: no hot water, pilot will not light or stay lit; no digital error code present.
|
Pilot Ignition Failure (Standing Pilot or Piezo Ignition) | View Details |
| – |
State gas water heater: burner has yellow, lazy flames and produces soot.
|
Incomplete Combustion / Improper Air-Fuel Mixture | View Details |
| – |
State power vent gas water heater: strong exhaust smell or flue gases in the room.
|
Vent System Leakage / Backdrafting | View Details |
| – |
State tankless water heater: hot water temperature fluctuates between hot and cold during a shower.
|
Temperature Fluctuation / Cold Water Sandwich | View Details |
| – |
State tankless water heater: unit makes loud vibrating or rattling noise when running.
|
Vibration / Mounting or Fan Imbalance | View Details |
| – |
State water heater (gas or electric): water is too hot at fixtures.
|
Overheating / Thermostat Out of Calibration | View Details |
| – |
State water heater: condensation or water pooling on top of the heater shortly after startup.
|
Condensation / Minor Top Leak | View Details |
| – |
State water heater: frequent clicking or cycling on and off with small temperature changes.
|
Short Cycling / Oversensitive Control | View Details |
| – |
State water heater: hot water runs out faster than it used to.
|
Reduced Effective Capacity | View Details |
| – |
State water heater: low hot water pressure or flow compared to cold.
|
Hot Side Flow Restriction | View Details |
| – |
State water heater: metallic or rusty colored hot water.
|
Internal Corrosion / Rust Contamination | View Details |
| – |
State water heater: rotten egg or sulfur smell in hot water only.
|
Hydrogen Sulfide Odor from Anode Reaction | View Details |
| – |
State water heater: rumbling, popping, or banging noises during heating.
|
Sediment Boiling / Scale Noise | View Details |
| – |
State water heater: water leaking from drain valve at bottom of tank.
|
Leaking Drain Valve | View Details |
| – |
State water heater: water leaking from the bottom of the tank.
|
Tank Leakage / Inner Tank Failure | View Details |
| – |
State water heater: water leaking from the temperature and pressure (T&P) relief valve discharge pipe.
|
T&P Valve Discharge | View Details |
| – |
State water heater: water not hot enough or lukewarm.
|
Underheating / Insufficient Recovery | View Details |
| – |
State water heater: whistling or high-pitched noise when hot water is running.
|
Flow Restriction / Partially Closed Valve | View Details |
No matching codes found
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