Bosch Dryer E08 Error Code: Drum Temperature Sensor (NTC) / Electronic Fault

What the code means

Bosch's US dryer error code guide lists E08 with E06, E09, 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 E08 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 dryer, as quoted by the technician reference MyPros+: E:08 = drum temperature NTC defective, a drying tunnel inlet NTC error, 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; the inlet sensor tells the control how hot the air entering the drum is, so if its reading makes no sense the control stops the dryer and shows E08. Because that service description comes from one model's manual, other Bosch models may use E08 slightly differently, which is why the technician should confirm it. E08 is the inlet-side sensor; E09 on the same list is the outlet (heating circuit) sensor, and E90 shares Bosch's consumer wording (see our Bosch E09 and E90 pages).

Likely causes

• A defective drum temperature sensor (NTC) at the drying tunnel inlet (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 E08
• 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 E08 returns, stop there. The sensor and its 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
• E06 Bosch Dryer E06
• E09 Bosch Dryer E09
• E63 Bosch Dryer E63

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 E08 (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:08, quoting the Bosch WTG865H2UC service manual error list p. 3 (drum temperature NTC defective, drying tunnel inlet NTC error; first step check NTC harness and connectors)