Speed Queen Dryer Error Code OPEN THERMISTOR ERROR

It means the output board detected a temperature reading below 0°F (-18°C) after the heater had been running for at least 3 minutes. That reading indicates the thermistor circuit is completely open, meaning no valid temperature signal is reaching the board. The most likely cause is a failed thermistor or a break in the wiring connecting it to the control board.

You should not continue running the dryer with this error active. The thermistor is part of the temperature regulation system, and without a working sensor the control board cannot properly monitor or control heat levels. Operating the dryer in this condition could lead to overheating or inadequate drying performance.

Disconnect power to the dryer before starting any testing. Locate the thermistor, disconnect its wiring harness, and use a multimeter set to measure resistance across the two thermistor terminals. An open reading (infinite resistance, or no continuity) confirms the thermistor has failed and needs replacement. You should also test the wiring harness for continuity from the thermistor connector back to the output board to rule out a broken wire.

The error can be cleared by pressing any cycle selection pad once the temperature reading rises above 0°F (-18°C), but if the underlying fault is still present the error will return. Clearing the code without repairing the thermistor or wiring is only useful as a diagnostic step to confirm the fault is active. A permanent fix requires identifying and correcting the open circuit.

If only the thermistor needs replacement, parts typically range from $15 to $50 depending on the model, and the repair is relatively straightforward. If the issue turns out to be damaged wiring or a connector, repair costs are mostly labor. An output board replacement, if needed, can range from $100 to $250 or more for parts alone.