State Water Heater E49 Error Code — What It Means
E49 is not a universal error code across all State water heaters. State does not use standardized fault codes across all product families, so E49 means different things depending on your exact model and control board type. The code indicates an electronic fault has been detected, but the specific sensor, switch, or component that triggered it can only be identified by cross-referencing your model number with the factory service documentation. Do not assume E49 means the same thing on two different State models.
Your first step is to locate the rating plate on the side or front of the water heater, write down the full model number and serial number, and pull the correct technical manual or support document from State’s resources. Only that document will tell you which part E49 refers to on your specific heater. Guessing or replacing parts without confirming the model-specific definition wastes time and money.
Common Causes
- Model-specific sensor failure The E49 code on your model may point to a failed temperature sensor, pressure switch, flame sensor, or other component unique to that product line.
- Control board miscommunication A loose or corroded wire harness connection between the board and the triggered sensor can register as a fault even when the sensor itself is working.
- Power interruption or voltage spike A brief loss of power or electrical surge can cause the control to log a transient fault that may clear after a full power cycle.
- Blocked or restricted airflow On power-vented or direct-vent models, a blocked intake or exhaust can cause pressure switch faults that display as model-specific error codes.
- Component out of specification The sensor or switch tied to E49 in your model may be reading a value outside the control board’s acceptable range due to wear or calibration drift.
Step-by-Step Fix
- Record the displayed code exactly as it appears on the screen, including any flashing pattern or accompanying codes.
- Locate the rating plate on the side or front panel of your State water heater and write down the complete model number and serial number.
- Download or access the service manual for your exact model from State’s technical support library or scan the QR code on the rating plate if available.
- Look up code E49 in the fault code table for your model to identify the specific component or condition that triggers this code on your heater.
- Perform a full power cycle by turning off the circuit breaker or disconnecting power for two minutes, then restoring power to see if the fault clears.
- Inspect the identified component (sensor, switch, or harness) for visible damage, corrosion, loose connectors, or signs of water intrusion.
- Test the component using the ohm, voltage, or continuity values specified in your model’s service manual, and replace only if readings fall outside the documented range.
- Clear the fault according to your manual’s procedure, restore power, and monitor the heater through a complete heating cycle to confirm normal operation.
Parts Often Needed
| Part | Notes |
|---|---|
| Model-specific temperature sensor or thermistor | Amazon | Confirm the exact part number from your model’s service manual before ordering. |
| Pressure switch or air proving switch | Amazon | Common on power-vented models; verify your model uses this component for E49. |
| Control board or integrated controller | Amazon | Replace only if diagnostic testing and the manual confirm board failure, not the sensor. |
| Wiring harness or connector kit | Amazon | Use if pins are corroded or the connector housing is damaged at the fault point. |
When to Call a Pro
Call a licensed plumber or water heater technician if you cannot locate your model’s service documentation, if the fault code table is not available for your heater, or if you are uncomfortable working with electrical testing equipment. Also call for help if the identified component tests within specification but the code persists, if you see signs of water damage inside the control compartment, or if the heater is still under warranty and you want factory-authorized service. A qualified tech has access to State’s technical bulletins and model-specific fault trees that are not published for homeowner use.