Bosch F27

Bosch error code F27 indicates: Bosch Serie 4 / Serie 6 / Serie 8 / HomeProfessional EcoSilence Drive: Pressure sensor zero-point calibration drift F27; sensor reports residual water pressure with completely empty tub..

The primary root cause for Bosch code F27 is: On Bosch washers: Trapped air pressure in sensor tube due to clogged sump trap, mechanical membrane fatigue, or damaged electronic amplifier on PCB..

To resolve error code F27: Disconnect pressure hose at sensor while tub is empty to equalize atmospheric pressure. Reattach hose securely with spring clamp. Replace sensor if drift persists. 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 F27 persists, the physical component causing On Bosch washers: Trapped air pressure in sensor tube due to clogged sump trap, mechanical membrane fatigue, or damaged electronic amplifier on PCB. 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.