State Water Heater E108 Error — What It Means
State Water Heaters do not use an E108 error code in their official documentation. This code does not appear in State’s diagnostic system. The confusion likely comes from mixing up brands or misreading the display. Rheem water heaters (often confused with State due to shared manufacturing under A.O. Smith) use an A108 code to indicate a blocked condensate line. JULABO equipment uses E108 for an alarm latch reset issue. State Water Heaters typically display codes like E1 (ignition failure), E2 (thermistor fault), or E3 (overheat).
If you see E108 on what you believe is a State unit, first verify the exact brand by checking the rating plate on the side of the tank. Scan the QR code on that plate to access the correct error code manual for your specific model. If you have a Rheem unit showing A108, the condensate drain line is clogged with sludge, mold, or dust and needs cleaning. If you have a different brand or the display shows a similar but different code, consult that manufacturer’s documentation before attempting repairs.
Common Causes
- Wrong brand identification (~40%) The unit is actually a Rheem, Bradford White, or other brand that uses different error codes than State.
- Misread display (~30%) The code is actually E1, E10, or another valid State code that looks similar on the digital screen.
- Outdated or third-party documentation (~20%) You are reading a generic repair guide that lists codes from multiple brands without distinction.
- Control board software mismatch (~10%) A replacement control board from a different manufacturer was installed and is displaying non-standard codes.
Quick Diagnosis
Answer these to narrow it down fast.
Does the rating plate on the side of the tank say 'State Water Heaters' or a different brand name?
No: You have a different brand. Look up the error code for that specific manufacturer (Rheem A108 means condensate blockage, for example).
Does the display clearly show E108, or could it be E1, E10, or A108?
No: Look up the correct code (E1, E10, A108, etc.) in the owner's manual or the QR code portal for accurate troubleshooting steps.
Did you recently replace the control board or any electronic components?
No: Double-check the brand and model, then consult the official support documentation to identify the true error code and meaning.
Step-by-Step Fix
- Locate the rating plate on the side of the water heater and confirm the brand name printed on it.
- Scan the QR code on the rating plate with your smartphone to access the manufacturer’s support portal and error code library.
- Compare the displayed code with the official list for your model to identify the true code (E108 is not a State code).
- If the unit is a Rheem showing A108, locate the condensate drain line exiting the unit and inspect for clogs or standing water.
- If the unit is confirmed State and shows E108, power off the unit for 30 seconds, then restart and note if the code changes or clears.
- Contact the manufacturer or a licensed plumber if the code persists or does not match any documented error for your brand and model.
- Do not attempt repairs based on error codes from a different brand, as the underlying issue and fix will be completely different.
Parts Often Needed
| Part | Notes |
|---|---|
| OEM control board for State Water Heater | Amazon | Only if a licensed technician confirms the board is displaying incorrect codes and needs replacement. |
| Condensate line kit (for Rheem A108) | Amazon | If you confirmed the unit is Rheem and the code is A108, not E108 on a State unit. |
When to Call a Pro
Call a licensed plumber or water heater technician immediately if you cannot verify the brand and model, if the code does not match any documentation you can find, or if the unit is under warranty. Attempting repairs based on the wrong brand’s error code can damage the unit and void coverage. A pro can scan the control board, verify the true fault, and source the correct OEM parts. If the unit is a Rheem showing A108 and you are uncomfortable cleaning the condensate system or accessing internal components, a technician can clear the blockage and test flow pressure in 30 to 60 minutes.