Code: E28🌀 Bosch Dryer

Bosch Dryer E28 Error Code: Temperature Sensor (NTC) Circuit Fault

Reviewed 2026-10-26 · Based on 6 manufacturer & service sources

What the code means

Bosch's own dryer pages group E28 with E06, E08, E09, E24, E25, E36 and E90 as an electronic fault that only a qualified engineer can fix (Bosch Singapore words the same group as a heating circuit fault). The service-level meaning is more specific. MyPros+, quoting a Bosch dryer service manual (WTG864, test programs and fault codes, p. 3), lists E:28 as an NTC error: a break or short circuit in the NTC sensor or its cables, with the first step being to check the cables and the NTC. The German technician fault table at Der-Servicetechniker lists E28 on Bosch heat pump dryers as a compressor NTC fault (short or open circuit in the NTC or its cable; check wiring and NTC), and ersatzteilshop.de says E28 usually points to the temperature sensor at the compressor or its wiring. An NTC is a small thermistor whose resistance changes with temperature; when the control reads an impossible value (open or shorted), it stops the dryer and shows E28. Which sensor is involved depends on the model, so the technician should confirm it from your E-Nr. See also the related Bosch dryer pages for E08 (another NTC fault on some models), E24 and E90.

Likely causes

Safe DIY checks

⚠ Before you start

Unplug the appliance or switch off its breaker before opening panels.

  1. Write down 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 breaker for at least 5 minutes, then power it back on and try a short program. Bosch suggests this for its electronic fault codes.
  3. If E28 shows up only once and the dryer then runs normally, keep an eye on it and note when it happens.
  4. If E28 comes back, stop there. Bosch says this group of codes needs an experienced engineer, and the sensors sit inside the cabinet near live parts and, on heat pump models, the compressor.

🛠 When to call a pro

  • E28 returns after a power reset: call Bosch Customer Support at 1-800-944-2904 (US) or book an authorized technician, and give them your E-Nr.
  • Ask them to measure the NTC sensor and check its wiring and connectors first, since Bosch service material lists those as the first checks.
  • If the sensor and harness test good, the control electronics may need diagnosis; boards are model-specific.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Dryer temperature sensor (NTC thermistor)

Only after a technician confirms which NTC failed. On heat pump models it's often the compressor sensor. Match the part to your Bosch E-Nr.

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⚙

Multimeter

What a technician uses to check NTC resistance and harness continuity.

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⚙

Dryer control board

Only if the sensor and wiring test good. Boards are model-specific; match your E-Nr.

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Sources

  1. Bosch US: Dryer Error Codes guide (E06, E08, E09, E24, E25, E28, E36 or E90: electronic fault; 1-800-944-2904)
  2. Bosch Qatar: Dryer error codes (E08, E09, E24, E25, E28, E90: fault with the electronics, only an experienced engineer can fix it)
  3. Bosch Singapore: E08, E09, E24, E25, E28 or E90 (fault detected, don't attempt repairs yourself, book a Bosch engineer)
  4. MyPros+: Bosch Dryer Error Code E:28, quoting Bosch dryer service manual WTG864 p. 3 (NTC error: break or short circuit of NTC or cables; check cables and NTC)
  5. Der-Servicetechniker: Bosch dryer fault code table, German (E28 compressor NTC fault, short or open circuit in NTC or cable)
  6. ersatzteilshop.de: Bosch Trockner Fehler E28, German (usually the compressor temperature sensor or its wiring)

Last reviewed 2026-10-26. Always confirm against the manual for your exact model number.