Table of Contents
How to troubleshoot a Blanco dishwasher E4 error code-Step-by-step fix
You are probably feeling a little frustrated, and maybe even a little perplexed, about how to get things back on track if your Blanco dishwasher has recently thrown an E4 error code. Luckily, the E4 error is a common problem, and for the most part, it is something you can handle yourself without needing to call a repair technician. With just a little troubleshooting and patience, you will have that dishwasher running smoothly before you know it.
Here is what the E4 error code means, why it happens, and step-by-step instructions to fix it.
What Does the E4 Error Code Mean?
The E4 error code on a Blanco dishwasher usually points to some problem related to water. Most often, it points to a leak that has caused water to collect in the bottom of the dishwasher, which then trips the safety float switch. In other words, your dishwasher is trying to tell you there’s too much water where there shouldn’t be any, and it’s taking precautions to avoid further problems.

Common Causes of the E4 Error Code
Knowing what’s behind the E4 error will, therefore, help you come up with a suitable solution. The most common causes of this error include the following:
- Overloading: Putting too many dishes in the appliance or poorly loading items can make water escape during washing.
- Clogged Filters: Blockages in the filters can make water back up and leak.
- Poor Or Misaligned Door Seals: If the seal is not appropriately tight, a significant amount of water can start leaking out the dishwasher during cycling.
- Internal Leakage: Cracks in hoses inside or loose couplings can generate accumulation at the bottom. In such cases:
How to troubleshoot and therefore fix the E4 error
Step 1: Switch it Off and Plug it Out
Safety first. First, switch off the dishwasher and pull its plug from the power. This will eliminate any chances of shock when working on the appliance.
Step 2: Check and Clear the Dishwasher
Take out all dishes, pots, and pans, and racks from inside the dishwasher. Look to see if something is blocking the spray arms or filters-these are sometimes the causes for not draining properly.
Step 3: Look for Excess Water
E4 error usually arises when water has accumulated in the bottom of the dishwasher. Gradually tilt the entire appliance backwards at an angle of about 30–45-degree. Spillage of water would imply that the safety float switch has been turned on because of a leak or water accumulation. Make sure to place a towel or a shallow tray under the unit.
Step 4: Inspect the Seal on the Door
Look at the rubber gasket, or seal, around the door of the dishwasher. Look for any signs of cracking, wear, or misalignment. Any damage to the seal calls for replacement. If the seal is simply out of alignment, it can usually be adjusted back into position with a little care.
Step 5: Check the Filters
Pull out the filters from your dishwasher and then rinse them with warm water because debris or grease can build up inside them, causing it to malfunction by draining improperly, therefore pooling water in the bottom. Make sure after cleaning, these filters fit well into their appropriate slots.

Step 6: Check for Internal Leaks
Check the hoses and connections inside the dishwasher. Sometimes lower panels of the unit may need to be removed. Cracks, holes, or loose fittings in them should be apparent. Any loose connections are tightened and any damaged hoses are replaced.
Step 7: Test the Appliance
Once you have ruled out any likely causes, reconnect your dishwasher and run a quick cycle while you watch. If the E4 code no longer pops up, congratulations-you’ve solved the problem! If it keeps on appearing, you would most likely want to call in a professional for a further check.
How to Prevent E4 Errors Later
Now that you’ve cleared the E4 code, it’s time to keep your dishwasher running smoothly. Here are a few tips to prevent future issues:
- Load Dishes Properly: Avoid overloading the dishwasher and ensure items don’t block the spray arms or vents.
- Clean Filters Regularly: Make cleaning the filters part of your routine maintenance to prevent blockages.
- Check Seals Periodically: The condition and proper alignment of the door seals should be checked every few months.
- Run Maintenance Cycles: Run dishwasher cleaning agents periodically to prevent a grease and mineral buildup.
When to Call a Professional
If the abovementioned steps were carried out and the E4 error is still present, then the issue could be far deeper inside, which may involve professional intervention as there are inner parts that can be way too complicated for an amateur fix. Do not wait until it gets worse, just ask for help if necessary, which always works better than leaving the problem on for more significant damage.

Conclusion
While the Blanco dishwasher E4 error code looks quite daunting, the above steps put you on the best route to troubleshooting the problem for repair. Remember that maintenance has much to do with ensuring that a dishwasher gives ideal performance over time.
Have more questions on taking care of a dishwasher or about other common appliance errors? Leave them in the comments below, and we’re happy to help!