E-35Â Heatsink Thermistor fault in Toshiba drive
E-35 Heatsink Thermistor Fault fault in Toshiba drive
Description Distinct from "OH" (which means the drive is hot), E-35 means the temperature sensor *itself* is broken. The drive uses an NTC (Negative Temperature Coefficient) thermistor to monitor heat. If the circuit sees "Open" (infinite resistance) or "Short" (zero resistance), it knows the sensor data is invalid. It cannot safely run because it won't know if it overheats. Causes
1. Broken Wire: The tiny wires connecting the thermistor (glued to the heatsink) to the control board have snapped due to vibration.
2. Connector Corrosion: The plug connecting the thermal probe to the board is oxidized.
3. Sensor Failure: The thermistor bead has cracked. Solution This is a hardware repair. Power down and open the unit. Locate the temperature sensor (usually buried under the power module or screwed to the heatsink). Follow the wires back to the control board.
Unplug the sensor and measure its resistance. At room temperature (25°C), it should read a specific k-Ohm value (e.g., 10k or 30k Ohm, check service manual).
- If it reads Open (OL), the sensor is dead. - If it reads 0 Ohms, it is shorted.
You must replace the sensor assembly. On some sealed modules, the sensor is not replaceable, requiring a full drive replacement.
Description Distinct from "OH" (which means the drive is hot), E-35 means the temperature sensor *itself* is broken. The drive uses an NTC (Negative Temperature Coefficient) thermistor to monitor heat. If the circuit sees "Open" (infinite resistance) or "Short" (zero resistance), it knows the sensor data is invalid. It cannot safely run because it won't know if it overheats. Causes
1. Broken Wire: The tiny wires connecting the thermistor (glued to the heatsink) to the control board have snapped due to vibration.
2. Connector Corrosion: The plug connecting the thermal probe to the board is oxidized.
3. Sensor Failure: The thermistor bead has cracked. Solution This is a hardware repair. Power down and open the unit. Locate the temperature sensor (usually buried under the power module or screwed to the heatsink). Follow the wires back to the control board.
Unplug the sensor and measure its resistance. At room temperature (25°C), it should read a specific k-Ohm value (e.g., 10k or 30k Ohm, check service manual).
- If it reads Open (OL), the sensor is dead. - If it reads 0 Ohms, it is shorted.
You must replace the sensor assembly. On some sealed modules, the sensor is not replaceable, requiring a full drive replacement.
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