Bosch Dryer E:17 Reports the Exhaust Air Sensor Is Off

What E:17 means

You may first notice loads that finish too soon, run too long, or swing between both. In Bosch's problem table the cause is listed as the door NTC, shortened to TD, and the line test table puts that sensor in the exhaust channel. Its job is to measure the temperature of air leaving the drum. Once the reading is unreliable, the dryer loses a key way of deciding when a load is dry.

Common causes of E:17

NTC sensor in the exhaust channel that has failed or wandered out of range
Broken sensor wire, or a plug that has worked loose
Lint wrapped around the sensor housing that skews what it reads

✓ One safe check you can try

No test at home is safe, because an NTC is measured for resistance at its plug on a machine with the power isolated. You can help the visit by watching the pattern over a few loads: early stops, long runs, or both. Write it down, keep the dryer off meanwhile, and give us the notes when you book.

! Why to stop there

The sensor sits in the stream of exhaust air, where heat peaks, and the panels around it stay hot long after the drum stops.
Its wiring is thin and runs close to the heating circuit, so one nicked strand causes an on-and-off problem harder to find than the original.
Bosch gives the exhaust and heater sensors separate codes, and replacing the wrong one leaves the problem exactly where it was.
Mounting a new sensor a few millimeters off position gives wrong readings even though the part is fine.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Dryer codes

E:03Bosch Dryer E:03 Appears When Laundry Will Not Get Dry Enough E:11Bosch Dryer E:11 Is a Quiet Early Warning About Airflow E:15Bosch Dryer E:15 Means the Heating Circuit Is Not Working E:18Bosch Dryer E:18 Flags the Sensor Above the Heater E24Bosch Dryer E24 Means the Self-Check Found an Electronics Error E10Bosch Dryer E10 Points to the Control Module or Its Wiring E12Bosch Dryer E12 Means It Overheated From Blocked Airflow E52Bosch Dryer E52 Signals a Problem With the NTC Temperature Sensor

E:17E:17 questions

What is the exhaust sensor actually for?

It reports how warm the air is as it leaves the drum. The control uses that number, among others, to judge when clothes are dry and when to cut the heater.

Is it all right to keep using the dryer meanwhile?

It is no immediate hazard, but heat regulation is no longer dependable. We would have it seen soon, rather than put up with unpredictable cycles.

Does a new sensor always solve E:17?

Often, but not always. We test the wire and plug first, since a loose connection looks like a dead sensor, and you get a written price before we begin.