E03
Bosch Dryer
Severity: ModerateWhat Does This Error Mean?
The E03 error means your Bosch condensing dryer has a drainage or pump problem. Condensing dryers collect moisture from clothes as water, then pump it out. If the pump or drain is blocked, the dryer stops to prevent overflow.
Affected Models
- Bosch Series 4 Dryer
- Bosch Series 6 Dryer
- Bosch Series 8 Dryer
- Bosch Benchmark Series Dryer
Common Causes
- Condenser pump is clogged with lint or debris
- Water collection container (tank) is full and needs emptying
- Drain hose is kinked, blocked, or disconnected
- Condenser pump has failed and is not moving water
- Water level sensor or float switch has malfunctioned
How to Fix It
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Check and empty the water collection container.
On most Bosch condensing dryers, the water tank is in the top left corner of the appliance. Pull it out and empty it completely, then reinsert it firmly.
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Clean the condenser unit.
The condenser is usually accessed via a flap at the bottom front of the dryer. Remove it, rinse it under running water, and let it dry before reinserting.
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Check the drain hose if your dryer drains directly to a pipe.
Look for kinks, blockages, or a disconnected hose at the back of the machine. Straighten any kinks and make sure the hose end sits correctly in the drain.
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Unplug the dryer for 5 minutes and plug back in.
After clearing any blockages, a reset lets the control board try the pump again.
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Run a short test cycle and watch for E03 returning.
If the error comes back within the first few minutes, the pump itself is likely faulty and needs to be replaced.
When to Call a Professional
If emptying the tank and cleaning the pump does not resolve E03, the pump motor may have burned out. A technician can test the pump with a multimeter and replace it if needed.
Frequently Asked Questions
How often should I empty the water tank on my Bosch condenser dryer?
After every one or two loads, depending on load size and fabric type. Bosch recommends checking it before each cycle. A full tank is the most common reason for E03 — it is an easy fix.
What is the difference between a condenser dryer and a vented dryer?
A vented dryer blows moist air outside through a hose in the wall. A condenser dryer collects the moisture as water inside the machine. Condenser dryers do not need an external vent, making them more flexible to install.
Can a dirty condenser cause E03?
Yes, absolutely. A clogged condenser reduces the dryer's ability to extract moisture from the air. This puts extra strain on the pump and can trigger E03 over time. Clean the condenser every month for best results.