Bosch F3

Bosch error code F3 indicates: Overheating control module (T>100°C) / overheating cooking sensor (T>100°C).

The primary root cause for Bosch code F3 is: Pot or pan too big; Pot or pan faulty (bottom curved); Pot or pan not placed centered; Thermal insulation of the heating zone faulty; Heating zone is not pressed correctly against the glass ceramic from below; pot too big; Pot faulty (bottom curved); Pot not placed centered; too little liquid in the pot.

To resolve error code F3: use a suitable pot or pan; use a flawless pot or pan; Place the pot or pan in the center; replace faulty heating zone; mount the heating zone correctly; use suitable pot; use defect-free pot; Place the pot in the center; fill in the prescribed minimum quantity; see instructions for use

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Bosch code F3 persists, the physical component causing Pot or pan too big; Pot or pan faulty (bottom curved); Pot or pan not placed centered; Thermal insulation of the heating zone faulty; Heating zone is not pressed correctly against the glass ceramic from below; pot too big; Pot faulty (bottom curved); Pot not placed centered; too little liquid in the pot must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test Immersion / Air Heating Element & Klixon Thermostat across Between element terminals (unwired). Insulation to earth casing: >20MΩ (OL). Expected nominal reading is 25Ω–28Ω (230V / 2000W) / <0.5Ω (Safety Klixon closed). Tolerance: Formula R = V²/P (±5%). Any earth leakage reading below 2MΩ will trip the domestic 30mA RCD breaker..

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.