# How to Fix Bosch Error E25 (Turbidity Sensor)
The E25 error code is specific to newer Bosch washing machines, particularly those with sophisticated water usage management systems. While it may seem daunting, this guide will walk you through diagnosing and fixing the issue.
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## 1. Explanation: What is Bosch Error E25?
The Bosch E25 error code indicates a fault with the **Turbidity Sensor**.
**What is the Turbidity Sensor?**
The turbidity sensor measures the clarity or “dirtiness” of the water during the wash and rinse cycles. This data helps the machine determine how much water to use, how many rinse cycles are needed, and how long the wash should run.
**In plain English:** The machine is unable to accurately measure how dirty the water is, preventing the wash cycle from progressing correctly or completing efficiently. The machine is throwing the E25 code because it is receiving unreliable (or no) feedback from the sensor.
**The Likely Culprit:** A faulty or heavily obstructed Turbidity Sensor.
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## 2. Step-by-Step Fix: Diagnosing and Replacing the Sensor
Before assuming the sensor is completely broken, you must rule out simple obstructions or power issues. Always follow proper safety protocols when opening your washing machine.
### ⚠️ Safety First: Unplug the machine!
Always unplug the machine from the wall socket and turn off the water supply before performing any inspections or repairs.
### Step 1: Perform a Hard Reset
Sometimes, an E25 error is a temporary electronic glitch.
1. Unplug the washing machine completely.
2. Wait 5 to 10 minutes (this ensures all residual power drains from the control board).
3. Plug the machine back in.
4. Attempt to run a short diagnostic cycle (like a quick rinse) to see if the error clears.
### Step 2: Check for Obstructions in the Drain Path
While the E25 is a sensor error, poor water flow can sometimes cause inaccurate readings.
1. **Check the Drain Pump Filter:** Located usually behind a small door at the bottom front of the washer. Unscrew the cap slowly (have towels ready for spilled water). Remove any coins, lint, or debris.
2. **Check the Drain Hose:** Ensure the drain hose at the back of the machine is not kinked, crushed, or pushed too far down the standpipe.
### Step 3: Locate and Inspect the Turbidity Sensor
The Turbidity Sensor is typically located underneath the washing drum in the **sump area** (the lowest point where the water collects before draining). Accessing this usually requires removing the back or front panel of the machine.
1. **Gain Access:** Depending on your model, you may need to tilt the machine back and remove the base panel, or remove the back service panel.
2. **Locate the Sensor:** It is a small, typically black or gray plastic component often screwed or clipped into the large rubber or plastic housing of the sump. It will have a wire harness connecting it to the main control board.
3. **Inspect and Clean:**
* Carefully remove the sensor (you may need a screwdriver or simply squeeze a release clip).
* Visually inspect the sensor tip. Is it covered in soap residue, lint, grease, or calcium buildup?
* Gently wipe the sensor clean using a damp cloth or a soft brush. *Do not use harsh chemical cleaners.*
4. **Inspect Wiring:** Check the wire harness connecting the sensor. Ensure the wires are firmly seated, and look for signs of corrosion or cuts.
### Step 4: Sensor Replacement (If the Error Persists)
If you have cleaned the sensor, checked all wiring, and verified that the drain system is clear, but the E25 error immediately returns, the sensor itself has failed and must be replaced.
1. **Acquire the Replacement:** Ensure the replacement part number matches your specific Bosch model number.
2. **Install the New Sensor:** Carefully clip or screw the new sensor into the sump housing.
3. **Reconnect Wiring:** Reattach the wire harness securely.
4. **Test:** Reassemble the panels and run a test cycle. The E25 error should now be gone.
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Check the price for a replacement Turbidity Sensor here: https://www.amazon.com/s?k=Bosch+Turbidity Sensor&tag=trivian-20