Bosch F31

Bosch error code F31 indicates: Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Maximum safety water level exceeded F31; overflow protection trips, inlet valves closed and drain pump energized..

The primary root cause for Bosch code F31 is: On Bosch washers: Mechanically jammed inlet solenoid valve seat, shorted inlet triac continuing to feed coil, or clogged air trap creating false pressure..

To resolve error code F31: Shut off water tap. If water continues filling while unplugged, replace defective inlet valve assembly. If water stops when unplugged, replace power PCB. 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 F31 persists, the physical component causing On Bosch washers: Mechanically jammed inlet solenoid valve seat, shorted inlet triac continuing to feed coil, or clogged air trap creating false pressure. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test Mechanical Pressure Switch Contacts / Inductive Frequency Sensor across Across switch spade contacts with harness unplugged; electronic output: 40Hz–50Hz frequency signal. Expected nominal reading is Mechanical: Continuity 0.0Ω–0.2Ω (Empty: 11-12, Full: 11-14). Electronic: 20Ω–45Ω coil resistance.. Tolerance: Mechanical switch contacts must transition cleanly on gentle breath pressure. Coil ~22Ω ±5%..

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.