Thermador error code · Temperature Sensor Fault
Thermador Freedom Column Temperature Sensor (Thermistor) Fault
A Thermador Freedom column temperature sensor fault means a thermistor reads open or shorted, so the control mis-regulates cooling. Replace the sensor.
A Thermador Freedom column temperature sensor fault means one of the thermistors (cabinet, evaporator, or defrost sensor) is reading open or shorted, so the control can no longer trust the temperature and mis-regulates cooling. The fix is to confirm the thermistor's resistance is out of spec and replace the faulty sensor.
What Temperature Sensor Fault indicates
Freedom columns rely on thermistors whose resistance changes with temperature; the control converts that resistance into a temperature reading to decide when to cool and defrost. If a sensor reads open (infinite resistance) or shorted (near zero), the value falls outside any valid range and the control flags a sensor fault, then runs on a fail-safe schedule that cools too much or too little.
Likely causes
- Thermistor failed internally (open or shorted element)
- Moisture or condensation bridging the sensor leads
- Pinched, chafed, or broken sensor harness
- Corroded or loose connector at the control board
- Defrost-termination sensor degraded by repeated icing
What causes Temperature Sensor Fault
Thermistors fail from internal element breakdown after years of thermal cycling, moisture bridging the leads, or a chafed or pinched harness shorting or opening the circuit. Connector corrosion at the board and condensation in the sensor pocket are common. A defrost sensor can also fail from repeated icing if the defrost system is struggling.
Symptoms you may notice
- Cabinet runs much too cold (food freezing) or too warm, with no middle ground
- Displayed temperature does not match an independent thermometer
- Compressor runs nearly continuously or barely cycles
- Sensor or service warning, or an erratic temperature reading on the display
- Frost problems if the defrost-termination sensor is the failed one
Parts typically replaced for Temperature Sensor Fault
- Cabinet (air) thermistor — Replace when its ohms are out of spec for the temperature it senses and the air reading is wrong
- Evaporator / defrost thermistor — Replace when the coil or defrost-termination sensor reads open or shorted
- Sensor wiring harness / connector — Replace or repair if the open/short is in the wiring rather than the thermistor
Owner-safe checks for Temperature Sensor Fault
- Compare the displayed temperature to a separate thermometer placed in the cabinet
- Power-cycle the column at the breaker and watch whether the reading stabilizes or stays erratic
- Make sure airflow is not blocked, which can mimic a sensor problem
- Note whether the box runs too cold or too warm and report it; do not disturb sensor wiring yourself
When to call a technician
Confirming a sensor fault requires measuring the thermistor's resistance against its temperature curve and isolating the sensor from the harness, then accessing the sensor mount. A technician verifies which thermistor failed before replacing parts so the control regulates correctly again.
Frequently asked
Thermador Temperature Sensor Fault: people also ask
What is a temperature sensor fault on a Thermador Freedom column?
It means a thermistor (cabinet, evaporator, or defrost sensor) is reading open or shorted, so the control cannot trust the temperature and mis-regulates cooling, running the box too cold or too warm.
Can I fix a sensor fault myself?
You can verify the symptom with a separate thermometer and power-cycle the unit, but measuring thermistor ohms and replacing the sensor requires a meter and disassembly, so it is a technician repair.
Which sensor failed on my column?
There are usually a cabinet (air) sensor, an evaporator sensor, and a defrost-termination sensor. The symptom pattern and ohm testing tell the technician which one is out of spec. The exact sensor count varies by model.
Why does the column freeze food with a sensor fault?
If the sensor reads warmer than reality, the control keeps cooling and overshoots, freezing food. A sensor reading colder than reality has the opposite effect and lets the box warm up.
Will resetting clear a sensor fault?
A power-cycle may clear a one-time glitch, but if the thermistor or its wiring is genuinely open or shorted the fault returns until the sensor is replaced.
Is a sensor fault expensive to fix?
The sensor itself is a modest part; most of the job is access and testing. Our diagnostic visit is a flat $89 and confirms which thermistor failed, with a 365-day warranty on the repair; call (650) 668-1554.
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