Bosch Dryer E03 — Condenser / Lint Filter Blockage
Bosch Dryer · Error code E03
What E03 Means
On condenser and heat-pump dryers, this signals reduced airflow caused by a clogged lint filter or blocked condenser unit. Dryer may run but takes excessively long or shuts down early.
Symptoms
- Cycles take much longer than normal
- Clothes still damp at end of cycle
- Filter cleaning icon flashing
- Dryer overheats or stops mid-cycle
Common Causes
Fluff buildup restricts airflow through the heat exchanger.
The slide-out condenser at the bottom needs rinsing periodically — usually every 50-100 cycles.
Behind the condenser, secondary fins can hold a lint mat that requires rinsing or brushing.
Reduces heat transfer and triggers airflow alarms.
Lint accumulates in the duct over years even with filters cleaned.
How to Fix It
- Open the door and remove both lint filters from the door frame — rinse under warm water until fully clean, then air dry.
- On condenser/heat-pump models, open the lower kickplate and pull out the condenser unit.
- Rinse the condenser under a faucet from both sides until water runs clear; let it drain fully before reinstalling.
- Inspect the condenser cavity for stuck lint and wipe out with a damp cloth.
- On heat-pump models, vacuum the evaporator fins gently with a soft brush attachment.
- Reinstall all components and close the kickplate firmly until it latches.
- Run a timed cycle to confirm the code clears and drying time returns to normal.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Bosch Dryer Codes
Verified against manufacturer documentation: bosch-home.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.