Electrolux Dishwasher Error Code iB4

The iB4 code means the turbidity sensor produced noisy or unstable readings when it attempted to calibrate at the start of a cycle. The turbidity sensor measures water clarity to help the machine adjust washing intensity. When calibration fails due to contamination or air bubbles, the dishwasher defaults to a high soiling level and continues the cycle. On some models, the 'B' in the code may appear as 'H', displaying as iH4, but both refer to the same fault.

Yes, the iB4 error does not indicate a safety hazard. The dishwasher is designed to continue the wash cycle even when this fault is detected, operating at a default high soiling setting. Your dishes will still be washed, though the machine may use more water and energy than necessary until the sensor issue is resolved.

If the fix is simply cleaning the turbidity sensor, there is no parts cost involved, only your time. If the sensor needs to be replaced, parts typically range from $30 to $80 depending on the model, with professional labor adding $80 to $150 or more. Checking and cleaning the sensor yourself first is always worth attempting before calling a technician.

Start by locating and cleaning the turbidity sensor, removing any grease, food residue, or mineral deposits from its lens. Check that you are using the correct type and amount of detergent to avoid excess sudsing. Running a short rinse cycle can help clear any air bubbles that may be trapped in the water lines. If cleaning does not resolve the issue and the error returns consistently, the sensor itself may need to be replaced.

A reset may temporarily clear the displayed code, but if the underlying cause, such as a dirty sensor or air bubbles, is not addressed, the error will return at the next cycle's calibration phase. It is best to inspect and clean the turbidity sensor before resetting so the sensor can calibrate cleanly on the next run.