# How to Fix Bosch Washing Machine Error E01 (Pump Blocked)
If your Bosch washing machine flashes the E01 error code, do not panic. This is one of the most common service issues and can often be resolved without calling a technician.
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## What Does Bosch Error E01 Mean?
The E01 error code signifies a **drainage fault**. The washing machine cannot successfully remove water from the drum within the allotted time, indicating that the drain pump is blocked, obstructed, or has failed entirely.
**The likely culprits are:**
1. **Blockage:** Foreign objects (coins, keys, socks, hairpins) trapped in the drain pump filter or impeller.
2. **Kinked Hose:** The drainage hose at the back of the machine is bent or squashed.
3. **Failed Pump:** The drain pump motor has electrically failed and needs replacement.
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## Step-by-Step Fix: Clearing the Blockage
Follow these steps carefully to diagnose and clear any potential blockage in your Bosch washer.
### Safety First!
**1. Unplug and Shut Off Water**
* **Crucial Step:** Immediately unplug the appliance from the wall socket.
* Turn off the water supply taps leading to the washing machine.
* *Warning: You will be dealing with standing water. Have several old towels and a shallow tray or pan ready.*
### Accessing the Drain Pump Filter
**2. Locate the Access Panel**
* The drain pump filter is typically located behind a small panel or door at the bottom front of the machine. Use a flat-head screwdriver or coin to gently pry the panel open.
**3. Drain the Residual Water**
* Most Bosch models have a small drain hose next to the main filter cap. Pull this hose out and place the end into your shallow tray. Remove the cap or stopper from the hose to allow the remaining water to drain out slowly.
* *If your model does not have the auxiliary hose, proceed carefully to Step 4.*
**4. Remove and Clean the Filter**
* Slowly twist the large drain pump filter cap counter-clockwise to remove it. Be prepared for any residual water to spill out.
* Thoroughly clean the filter, removing all lint, debris, and foreign objects. Rinse it well under running water.
### Inspecting the Pump Impeller
**5. Check the Impeller Cavity**
* With the filter removed, look inside the pump cavity (you may need a flashlight). You should see the **pump impeller**—the small fan-like blades that spin to force water out.
* **Safety Note:** Ensure the power cord is still unplugged.
* Carefully use your finger or a blunt object (like a pencil) to manually spin the impeller. It should rotate freely.
* If you encounter resistance, carefully remove any foreign objects lodged around the blades (hairpins, plastic, etc.).
### Reassembly and Test
**6. Reassemble the Unit**
* Once the impeller spins freely and the filter is clean, screw the filter cap back on tightly (clockwise).
* Replace the small drain hose cap (if applicable) and snap the access panel shut.
**7. Run a Test Cycle**
* Plug the washing machine back in and turn the water taps on.
* Select a short “Drain and Spin” cycle.
* If the machine successfully drains and completes the cycle without displaying E01, the issue was a blockage that you have resolved.
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## Advanced Diagnosis (If E01 Persists)
If you have thoroughly cleaned the pump filter and confirmed the impeller is spinning freely, but the E01 error returns immediately, the most likely remaining cause is an electrical or mechanical failure of the drain pump motor itself. In this case, the pump unit must be replaced.
**Check the price for a replacement Drain Pump here: https://www.amazon.com/s?k=Bosch+Drain Pump&tag=trivian-20**