What E:17 Means
E:17 is the exhaust-side temperature sensor fault. Bosch's fault table calls it the door NTC, abbreviated TD, and the line test table places that sensor in the exhaust channel. It is the sensor that tells the control how hot the air is as it leaves the drum, so when it stops reporting correctly the machine can no longer judge the end of a cycle by temperature.
Common Causes of E:17
- Exhaust channel NTC sensor failed or drifted
- Sensor wire broken or the connector loose
- Lint packed around the sensor housing affecting its reading
🔧 One Safe Check You Can Try
There is no safe home test, since an NTC is checked by measuring its resistance at the connector on an isolated machine. What helps is noting whether cycles have been ending early, running long, or both, because that pattern is useful to the technician.
⚠ Why You Shouldn't Go Further Than That
- The sensor sits in the exhaust path where the air is hottest, so it is reached through panels that stay hot well after the cycle ends.
- Its wiring is thin and runs alongside the heating circuit, where a nicked strand creates an intermittent fault that is far harder to find than the original one.
- Bosch separates the exhaust sensor from the heater sensor with two different codes, and swapping the wrong one leaves the fault exactly where it was.
- A sensor refitted a few millimetres out of position reads wrongly even though the part itself is new.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.