Bosch Dryer E03 code: Condensate drain hose blocked
On Bosch condensation dryers, the hose that carries away collected water is blocked or kinked.
Most common causes
- Kinked condensate drain hose
- Lint or debris inside the hose
- Hose installed higher than allowed
What you can safely check yourself
- Check the drain hose for kinks.
- Disconnect the hose and clear it with a long, flexible brush.
- Reconnect it following the installation guide.
Unplug the appliance before moving or cleaning anything. Do not open panels, touch gas connections or bypass safety switches.
Checked against: bosch-home.com. Meanings can vary by model; check your owner’s manual.