State Water Heater E152 Error Code — What It Means
E152 does not appear in standard State Water Heater or A. O. Smith documentation as a recognized fault code. State directs users to scan the QR code on the rating plate or download the model-specific manual from their support page to access the correct error-code definitions and troubleshooting steps for your exact heater. Without the precise model number and manual, the code meaning and repair procedure cannot be confirmed.
If your heater is displaying E152 and experiencing ignition or flame issues, the most common underlying causes across State and A. O. Smith platforms include blocked air intake, gas supply problems, dirty flame sensors, clogged inlet filters, or scale buildup. Do not attempt repairs until you have verified the code definition in your unit’s official manual.
Common Causes
- Incorrect code reference E152 may be a misread display or a code specific to a newer or regional model not covered in general State literature.
- Blocked air intake or vent Debris or lint blocking the combustion air inlet is a leading cause of ignition-related faults on State tankless and power-vent models.
- Gas supply issue Closed isolation valve, low gas pressure, or empty propane tank will prevent ignition and trigger fault codes.
- Dirty flame rod or sensor Carbon buildup or corrosion on the flame-sensing electrode prevents the control board from detecting flame presence.
- Clogged inlet water filter Sediment in the inlet screen reduces flow below the minimum threshold required to activate the burner on tankless units.
- Scale buildup on heat exchanger Hard-water scale restricts flow and causes overheating, leading to repeated safety shutdowns and error codes.
Step-by-Step Fix
- Locate the rating plate on your water heater and note the full model number and serial number.
- Scan the QR code on the rating plate or visit the State Water Heaters support website to download the correct installation and service manual for your model.
- Look up E152 in the manual’s error-code table to confirm the exact definition, affected component, and manufacturer-recommended diagnostics.
- Turn off gas at the appliance isolation valve and power at the breaker or disconnect before inspecting internal components.
- Check the combustion air intake and vent termination for blockages, nests, or lint accumulation and clear any obstructions.
- Inspect and clean the inlet water filter if your model is tankless or if the manual lists a serviceable screen.
- Reset the heater according to the manual’s procedure only after correcting the identified fault, and monitor for code recurrence.
Parts Often Needed
| Part | Notes |
|---|---|
| Flame rod or flame sensor | Amazon | Verify part number in your model’s manual or on the existing rod before ordering. |
| Inlet water filter screen | Amazon | Confirm your model has a serviceable filter and order the correct mesh size from State or an authorized distributor. |
When to Call a Pro
Call a licensed plumber or gas technician if you cannot locate a manual for your model, if the E152 code does not appear in your manual’s error table, or if the fault returns after you have cleared the air intake and verified gas supply. Any work involving gas-line connections, burner disassembly, or control-board replacement should be performed by a qualified professional. If your heater is under warranty, contact State customer support before attempting repairs to avoid voiding coverage.