State Water Heater E62 Error Code — What It Means
E62 is not documented in the available State Water Heaters technical literature as a standard fault code. State is an A. O. Smith brand, and many of their tankless and power-vent models use model-specific codes that vary by product family. Because E62 does not appear in generic State troubleshooting guides, you need to locate your exact model number and serial number from the rating plate on the unit and consult the matching manual or State’s QR code support system to confirm what E62 means for your appliance.
Most combustion-related shutdowns on State tankless and power-vent heaters share common root causes: blocked air intake or exhaust, insufficient gas supply, low water flow, dirty flame sensors, or control board and wiring faults. Until you verify the exact definition of E62 for your model, treat this as a persistent fault that requires methodical inspection of air, gas, water, and electrical systems rather than random part replacement.
Common Causes
- Blocked air intake or exhaust vent Lint, debris, or improper termination restricts combustion air or flue gas flow, triggering a safety shutdown on tankless and power-vent models.
- Insufficient gas supply or closed valve Low inlet pressure, a partially closed manual valve, or regulator failure prevents ignition or stable flame proving.
- Dirty or corroded flame sensor Carbon buildup or corrosion on the flame rod prevents the control board from detecting flame current, shutting down the burner.
- Low water flow or inlet filter blockage Restricted inlet screens, partially closed valves, or undersized fixtures drop flow below the minimum needed to energize the burner.
- Loose wiring or failed control board Vibration, moisture intrusion, or component aging can open sensor circuits or corrupt board logic, producing fault codes.
Step-by-Step Fix
- Locate the model and serial number on the rating plate or inside the access panel, then download the correct State manual or scan the QR code for model-specific fault code definitions.
- Verify gas supply by confirming the manual gas valve is fully open and checking inlet pressure at the appliance connection point with a manometer.
- Inspect the air intake and exhaust terminations for blockage, nests, or debris, and check that vent pipe runs meet the clearance and length limits in the installation manual.
- Check water flow conditions by cleaning the inlet filter screen, confirming isolation valves are fully open, and running a hot-water fixture to verify flow rate meets the minimum gallons-per-minute threshold.
- Examine the flame sensor or flame rod for carbon deposits or corrosion, disconnect power, remove the sensor, and polish the probe tip with fine abrasive cloth if buildup is present.
- Inspect all wiring harnesses and sensor connectors for loose pins, corrosion, or moisture, and reseat every connection at the control board and field devices.
- Power the unit back on, call for heat, and monitor for code recurrence. If E62 returns immediately, consult the fault tree in your model manual or contact State technical support with the exact model and code details.
Parts Often Needed
| Part | Notes |
|---|---|
| Flame sensor / flame rod | Amazon | Order the exact State part number for your model from the illustrated parts list in your manual. |
| Inlet water filter screen | Amazon | Clean or replace if flow restriction is confirmed during testing. |
| Control board assembly | Amazon | Replace only after verifying all sensors, wiring, and supply conditions are correct and the fault tree points to board failure. |
When to Call a Pro
Call a licensed plumber or gas technician if you cannot locate your model manual, if you are uncomfortable working with gas piping or 120/240V power, or if the code returns after you have verified gas supply, cleared blockages, and cleaned the flame sensor. Tankless and power-vent water heaters require precise combustion-air calculations and gas-pressure testing that are difficult to perform without a manometer and an understanding of your local codes. If E62 is a model-specific sensor or board fault, a technician with access to State’s service bulletins and the correct part supersession list will save you time and avoid unnecessary part swaps.