Error Code	Symptom	Fault Type	Guide
E001	Electronic GSW gas water heater will not ignite; display shows E001, and the burner never lights.	Ignition Failure Lockout	View Details
E002	GSW power vent gas water heater shows E002, and the blower starts then shuts off without ignition.	Pressure Switch / Venting Fault	View Details
E003	GSW electronic gas water heater displays E003 and shuts down shortly after ignition.	Flame Loss / Flame Sensing Error	View Details
E004	GSW power vent water heater shows E004, and the blower does not start.	Blower Motor / Inducer Failure	View Details
E005	GSW electronic gas water heater shows E005 and will not attempt ignition.	High Limit / ECO (Energy Cut-Off) Tripped	View Details
E006	GSW power vent water heater displays E006 and cycles the blower without ignition.	Air Intake Blockage / Combustion Air Fault	View Details
E007	GSW electronic gas water heater shows E007, and the display is blank or flickering.	Low Voltage / Power Supply Error	View Details
E008	GSW gas water heater shows E008 and shuts down with very hot water at the taps.	Temperature Sensor Out of Range (Overtemperature)	View Details
E009	GSW power vent water heater displays E009, and the unit locks out after several failed starts.	Ignition Retry Lockout	View Details
E010	GSW electronic gas water heater shows E010, and the burner shuts off before reaching the set temperature.	Thermostat / Sensor Communication Error	View Details
E011	GSW power vent water heater displays E011, and the blower runs continuously without firing.	Stuck Pressure Switch / Vent Proving Fault	View Details
E012	GSW electronic gas water heater shows E012, and the unit will not power up after a surge or outage.	Control Board Internal Fault	View Details
E013	GSW power vent water heater displays E013 and shuts down during operation on very cold days.	Intake / Exhaust Temperature Fault	View Details
E014	GSW electronic gas water heater shows E014, and the burner will not light after the tank has been drained and refilled.	Dry-Fire Protection / No Water Detected (primarily on electric models, but some controls monitor fill state)	View Details
E101	GSW electric water heater with electronic control shows E101 and no hot water.	Upper Heating Element Circuit Open	View Details
E102	GSW electric water heater shows E102, and water is only lukewarm.	Lower Heating Element Circuit Open	View Details
E103	GSW electric water heater displays E103 and trips the breaker when heating.	Element to Ground Short	View Details
E104	GSW electric water heater with digital display shows E104, and water is excessively hot.	Thermostat / Sensor Stuck Closed	View Details
E105	GSW electric water heater shows E105, and no hot water after a power outage.	High Limit (ECO) Tripped	View Details
E201	GSW hybrid or high-efficiency electric water heater shows E201 and runs only on backup elements.	Heat Pump Module Fault	View Details
–	GSW electric water heater has hot water, but recovery is very slow.	Single Element Operation / Lower Element Failure	View Details
–	GSW electric water heater has no hot water at all.	Total Power / Upper Circuit Failure	View Details
–	GSW gas water heater burner does not light even though the pilot is on (standing pilot models).	Gas Control Valve / Thermostat Failure	View Details
–	GSW gas water heater pilot will not light or stay lit (standing pilot models).	Pilot Flame / Thermocouple Failure	View Details
–	GSW gas water heater produces insufficient hot water or runs out quickly.	Capacity / Thermostat / Dip Tube Issue	View Details
–	GSW power vent water heater is very noisy (whining or rattling) during operation	Blower / Inducer Noise	View Details
–	GSW water heater T&P (temperature and pressure) relief valve is dripping or discharging water	Excessive Pressure / Temperature or Faulty T&P Valve	View Details
–	GSW water heater causes water hammer or banging noises in pipes when heating or when taps close	Hydraulic Shock / Expansion Noise	View Details
–	GSW water heater emits a rotten egg or sulfur smell from hot water taps	Bacterial Reaction with Anode Rod	View Details
–	GSW water heater leaks from the drain valve at the bottom of the tank	Leaking Drain Valve	View Details
–	GSW water heater leaks from the side or bottom of the tank body (not from fittings)	Tank Corrosion / Inner Tank Rupture	View Details
–	GSW water heater leaks from the top around the hot or cold connections	Leaking Nipple / Dielectric Union / Dip Tube Connection	View Details
–	GSW water heater makes popping, rumbling, or banging noises during heating	Sediment Boiling / Scale Buildup	View Details
–	GSW water heater outer jacket is very hot to the touch, or insulation seems inadequate.	Insulation Degradation / Overheating	View Details
–	GSW water heater produces discolored (rusty or brown) hot water	Internal Corrosion / Anode Depletion	View Details
–	GSW water heater shows signs of backdrafting (soot around draft hood, melted plastic, or exhaust smell)	Vent Draft / Combustion Spillage	View Details
–	The GSW water heater does not meet the set temperature at distant fixtures but is hot near the tank.	Distribution / Recirculation / Piping Issue	View Details
–	The GSW water heater trips the GFCI or AFCI outlet/breaker intermittently.	Ground Fault / Electrical Leakage	View Details

GSW Water Heaters Error Codes

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