Bosch Dryer Error E15 — What It Means & How to Fix It

What Does This Error Mean?

E15 means the secondary NTC temperature sensor in the Bosch dryer has reported a fault. This sensor monitors temperature in a secondary location — typically near the lint filter or exhaust area — to back up the main sensor. A failed or disconnected secondary sensor triggers E15 and the dryer stops to prevent overheating.

Affected Models

Bosch WTW87565GB
Bosch WTH84000GB
Bosch WQB145B0GB
Bosch WTW876H0GB
Bosch Serie 6 and Serie 8 Heat Pump Dryers

Common Causes

Secondary NTC thermistor has failed — resistance reading outside the normal range
Sensor wiring damaged — chafed, broken, or connector pulled loose
Lint buildup around the secondary sensor preventing accurate temperature readings
Moisture or condensation in the sensor housing causing a false fault reading
Control board fault causing incorrect interpretation of the sensor signal

How to Fix It

Unplug the dryer and wait 5 minutes, then restart.

A brief sensor glitch caused by a power fluctuation may clear with a reset. If E15 returns, the sensor circuit has a genuine fault.
Clean the lint filter and lint filter housing thoroughly.

Heavy lint buildup around the sensor area can cause temperature readings to behave erratically. Remove all lint from the filter, housing, and the area behind the filter.
Check that the dryer is not installed in an unusually hot or cold location.

Ambient temperatures below 5 degrees C or above 35 degrees C can cause secondary sensor readings to fall outside the normal range. Ensure adequate room ventilation.
If E15 persists, contact Bosch service — a technician will test the sensor and replace it if faulty.

A secondary NTC sensor is a small and inexpensive part. The repair cost is mainly the technician visit fee.

When to Call a Professional

E15 requires a technician to test the secondary NTC thermistor and its wiring. A multimeter resistance check confirms whether the sensor has failed or if the wiring is at fault. Contact Bosch customer service or a Bosch authorised engineer for a service visit.

Frequently Asked Questions

What is the difference between E15 and E02 on a Bosch dryer?

E02 is a fault with the primary NTC temperature sensor — the main sensor monitoring drum temperature. E15 is a fault with the secondary NTC sensor — a backup sensor in a different location, often near the lint filter or exhaust. Both trigger a safety shutdown, but each involves a different physical sensor.

How much does a Bosch dryer NTC sensor replacement cost?

A replacement NTC thermistor sensor typically costs £10–25 or $15–35 for the part. With technician labour, total repair cost is usually £80–180 or $100–220. Always confirm the correct sensor part number for your model before ordering.