Bosch Dryer E09 Error Code: Temperature Sensor (NTC) / Electronic Fault

What the code means

Bosch's US dryer error code guide lists E09 with E06, E08, E24, E25, E28, E36 and E90 as an electronic fault/error that can only be eliminated by an authorized technician. Bosch Middle East has a dedicated E09 page with the same message (a fault with the electronics, to be eliminated by an experienced engineer), and Bosch Singapore describes the E08 to E90 group as a fault detected in the heating circuit. The more specific meaning comes from Bosch's service manual error list for the WTG865H2UC heat pump dryer, as quoted by the technician reference MyPros+: E:09 = heating circuit NTC defective, meaning the drying tunnel outlet NTC on heater (vented or condenser) dryers or the cooling circuit NTC on heat pump dryers, and the first diagnostic step is to check the NTC wire harness and connectors. An NTC is a temperature sensor (thermistor) whose resistance changes with heat; if the control reads a value that makes no sense, it stops the dryer and shows E09. Because that service description comes from one model's manual, other Bosch models may use E09 slightly differently, which is why the technician should confirm it. E09 shares Bosch's consumer wording with E90 (see our Bosch E90 page), but it is a separate code.

Likely causes

• A defective heating-circuit temperature sensor (NTC): the drying tunnel outlet sensor on heater dryers or the cooling circuit sensor on heat pump dryers (Bosch WTG865H2UC service error list, via MyPros+)
• A loose, corroded or damaged NTC wire harness or connector, which is the first thing that service list says to check
• A fault in the dryer's electronic control, which is how Bosch's US and Middle East error code tables describe E09
• A temporary electronics glitch after a power interruption, which a 5-minute power reset can sometimes clear (Bosch US guide)

Safe DIY checks

1. Turn the dryer off and note the exact code and your model number (E-Nr) from the rating label inside the door.
2. Power reset: unplug the dryer or switch off its circuit breaker for at least 5 minutes, then restore power. Bosch says a power cycle can often clear error codes and reset the electronics.
3. Run a short program with a small load. If it finishes normally, watch the next few loads.
4. Clean the lint filter (and on condenser models the heat exchanger, as Bosch recommends). It won't fix a sensor fault, but it rules out airflow problems behind other codes.
5. If E09 returns, stop there. The sensors and their wiring sit inside the cabinet, and Bosch says this fault is for an authorized technician, so don't open the dryer or bypass anything.

Parts that commonly fix it

Always match the part number to your exact model.

Related codes

• DR Bosch Dryer DR
• E01 Bosch Dryer E01
• E08 Bosch Dryer E08
• E90 Bosch Dryer E90
• F6 E2 (F6E2) Amana Dryer F6 E2 (F6E2)

All Bosch codes →

Sources

1. Bosch US: Dryer Error Codes guide (E06, E08, E09, E24, E25, E28, E36 or E90: electronic fault, authorized technician only, 1-800-944-2904; power cycle reset for at least 5 minutes)
2. Bosch Middle East: Dryer Error Code E09 (fault with the electronics, experienced engineer only)
3. Bosch Singapore: E08, E09, E24, E25, E28 or E90 (fault with the heating circuit, book a Bosch engineer)
4. MyPros+: Bosch Dryer Error Code E:09, quoting the Bosch WTG865H2UC service manual error list p. 3 (heating circuit NTC defective: drying tunnel outlet NTC on heater dryers or cooling circuit NTC on heat pump dryers; first step check NTC harness and connectors)