Bosch F38

Bosch error code F38 indicates: Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: NTC temperature sensor short-circuit fault F38; sensor lines shorted together or to ground, reading > 120°C..

The primary root cause for Bosch code F38 is: On Bosch washers: Melted wire insulation chafing against metal tub frame, internal breakdown in thermistor body, or water bridging connector pins..

To resolve error code F38: Measure NTC resistance (must NOT be 0 Ω or < 500 Ω at room temperature). Inspect wiring for chafing against chassis. Replace NTC sensor. Turn dial to 6 o'clock (down), hold Spin button, rotate to 7 o'clock, release Spin button, turn to 12 o'clock (Off).

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code F38 persists, the physical component causing On Bosch washers: Melted wire insulation chafing against metal tub frame, internal breakdown in thermistor body, or water bridging connector pins. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.