Freezer displays E1 and temperature rises above setpoint; compressor may not start or runs briefly then stops.

Safety first: Unplug the freezer from the mains before removing any panels or touching wiring. Use insulated tools and avoid working on live circuits.

• Power reset: Disconnect power for 5–10 minutes, then reconnect. If E1 returns, continue with checks.
• Locate the freezer NTC sensor: On most Teka upright and chest freezers, the freezer NTC is clipped to the evaporator or mounted behind the inner liner (often near the rear wall or side wall). Remove the internal plastic cover or rear evaporator cover as needed.
• Inspect wiring and connector: Check the NTC leads for cuts, pinches, or corrosion. Ensure the plug is firmly seated on the main PCB (usually behind the top or rear service panel).
• Measure sensor resistance: With the unit unplugged, disconnect the NTC from the board and measure resistance with a multimeter. At around 25°C, most Teka NTCs read roughly 4–10 kΩ (consult the service sheet if available). An open circuit (OL) or 0 Ω indicates a failed sensor.
• Check continuity of harness: If the sensor measures correctly, test continuity from the sensor connector to the PCB connector to rule out a broken wire.
• Replace the NTC sensor if faulty: Remove the old sensor from its clip or sleeve, route the new sensor along the same path, and secure it away from moving parts and sharp edges. Reconnect to the PCB.
• If sensor and wiring are good: The fault may be in the main control board’s sensor input. Inspect the PCB for burnt components or corrosion. Replacement of the main PCB is usually required if confirmed faulty.

Test: Reassemble covers, restore power, and monitor if the E1 code clears and the freezer reaches the correct temperature within several hours.