# How to Fix Bosch Error E04 (Pump Motor Fault)
The Bosch E04 error code is one of the more common issues faced by washing machine owners, directly related to the crucial function of draining water. Before calling a technician, most users can resolve this issue by performing simple diagnostic checks.
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## 1. Explanation: What does E04 mean?
The E04 error code indicates a **Pump Motor Fault**.
In plain English, this means the washing machine’s control board has detected that the drain pump is not operating correctly, is jammed, or is taking too long to evacuate the water from the drum. This usually results in standing water left in the machine after a wash cycle attempts to complete.
The likely cause is either a physical blockage (the most common scenario) or the complete electrical failure of the **Drain Pump** motor itself.
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## 2. Step-by-Step Fix: How to Diagnose and Clear the Fault
**Safety Warning:** Always unplug the washing machine from the wall outlet before inspecting the drain pump, filter, or hoses. Have towels and a shallow pan ready, as water will leak out when you open the filter trap.
### Step 1: Power Reset and Drain Hose Check
1. **Hard Reset:** Unplug the machine from the power socket for at least 5 minutes. Plug it back in and try running a short drain/spin cycle to see if the error clears.
2. **Inspect the Drain Hose:** Ensure the hose at the back of the machine that leads to your drain pipe is not kinked, crushed, or positioned too high (which can prevent proper gravity drainage).
### Step 2: Clear the Drain Pump Filter (The Sump Trap)
The most frequent cause of E04 is a blockage in the filter located at the very bottom front of the machine.
1. **Locate the Filter:** Open the small access door or panel at the bottom right or left of the washer’s front face.
2. **Drain Residual Water:** You will usually see a small hose and a large circular cap (the filter). Pull the small hose out, remove its stopper, and allow the residual water to drain into your pan or towels.
3. **Remove the Filter:** Once the water is mostly drained, slowly twist the large circular cap (the filter) counter-clockwise and pull it out completely.
4. **Clear Debris:** Inspect the filter for debris. Common culprits include coins, keys, hairpins, lint, or small pieces of clothing (like socks).
5. **Inspect the Impeller:** With the filter removed, shine a flashlight into the pump housing. You should see the plastic fan blade (impeller) of the pump motor. Try to gently spin it with your finger. If it is stiff or jammed, remove the object causing the obstruction. The impeller must spin freely.
### Step 3: Check for Blockage in the Pump Outlet Pipe
If the filter and impeller are clear, the blockage might be further down the drain pipe connected to the pump.
1. **Access the Pump:** This step is more advanced and may require removing the rear or front panels of the washer to access the pump unit (usually held in place by clamps or screws).
2. **Inspect Hoses:** Disconnect the thick corrugated hose leading from the drum to the pump, and the hose leading from the pump to the drain. Check inside these hoses for blockages that may have bypassed the filter.
### Step 4: Advanced Diagnosis: Testing the Pump Motor
If the impeller is completely clear, the hoses are clear, and the error persists, the drain pump motor itself has likely failed electrically.
* **Symptoms of Failure:** If the pump impeller spins freely, but when the machine attempts to drain, you hear nothing (no humming, whirring, or clicking), the motor is likely dead.
* **Replacement:** At this stage, you must replace the drain pump unit.
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## 3. Call to Action
Check the price for a replacement Drain Pump here: https://www.amazon.com/s?k=Bosch+Drain+Pump&tag=trivian-20