Miele F4157

Miele error code F4157 indicates: The device interrupts the program, indicating that a safe water level has been reached..

The primary root cause for Miele code F4157 is: Level pressure switch 2B1/13 has activated its contact 1-3, signaling a water level too high, which may be due to overfilling or a faulty pressure switch..

To resolve error code F4157: 1. Disconnect the power supply. 2. Visually check the water level in the tank. 3. If the level is too high, inspect the water inlet solenoid valve. 4. If the level is normal, check the 2B1/13 pressure switch, its compression chamber and its wiring. 5. Test contact 1-3 for continuity and replace pressure switch if stuck.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Miele code F4157 persists, the physical component causing Level pressure switch 2B1/13 has activated its contact 1-3, signaling a water level too high, which may be due to overfilling or a faulty pressure switch. 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.