Freezer displays E9 and may show very high or very low temperature readings that do not match actual conditions.

Safety: Disconnect power before working on sensors or wiring.

• Compare displayed vs actual temperature: Place a reliable thermometer inside the freezer and compare after several hours.
• Inspect recently replaced sensors: If a sensor was changed, verify that the correct Teka part number and NTC curve were used.
• Check for moisture and shorts: Ensure sensor connections are dry and not touching bare metal that could cause a short.
• Measure sensor resistance: Test each NTC at a known temperature and compare to manufacturer data. Replace any sensor that is out of range.
• Inspect harness: Wiggle the harness while measuring resistance to detect intermittent faults. Repair or replace if readings fluctuate.
• PCB firmware issue: If all sensors and wiring are correct, the main PCB may have a calibration or ADC fault and should be replaced.

Test: After corrections, power the unit, clear the error, and verify that displayed temperature tracks the internal thermometer within a few degrees.