Speed Queen Washer SH Error Code — What It Means
The SH code on a Speed Queen washer indicates a shorted thermistor or temperature sensor fault. The control board has detected that the temperature sensing circuit is reading out of range, which prevents the machine from heating water properly or completing cycles. This is a specific electrical fault where the sensor circuit is either sending a shorted signal or the sensor itself has failed internally. The machine will not run normally until the problem is corrected.
Common Causes
- Failed thermistor or temperature sensor The sensor itself has shorted internally and is no longer giving valid readings to the control.
- Damaged or shorted wiring The wiring between the thermistor and the control board has been cut, pinched, or abraded, creating a short circuit.
- Loose or corroded connector The plug at the thermistor or control board has worked loose, has corrosion, or has poor pin contact causing intermittent shorts.
- Water intrusion at sensor Moisture has entered the sensor assembly or connector, creating a short across the thermistor leads.
Step-by-Step Fix
- Unplug the washer and wait two minutes, then restore power to see if the fault clears on its own after a reset.
- Remove the top or rear panel as needed to access the thermistor, which is typically mounted in or near the outer tub or heater assembly.
- Inspect the thermistor connector for corrosion, water intrusion, loose pins, or visible damage, and disconnect it carefully.
- Check the wiring harness from the thermistor back to the control board for pinched, cut, or abraded insulation that could cause a short.
- Test the thermistor resistance if you have a multimeter and service data for your model, looking for a shorted (zero ohm) reading or values outside the expected range.
- Replace the thermistor if it shows a short or damaged wiring, reconnect all plugs securely, and reassemble the panels.
- Run a test cycle to confirm the SH code does not return and the washer heats and operates normally.
Parts Often Needed
| Part | Notes |
|---|---|
| Speed Queen thermistor / temperature sensor | Amazon | Verify your exact model number to match the correct thermistor assembly. |
| Wiring harness (thermistor to control) | Amazon | Only if you found visible damage or shorts that cannot be repaired with tape and heat-shrink. |
When to Call a Pro
Call a technician if you are not comfortable working with electrical components or disassembling the washer cabinet. If you replaced the thermistor and checked all wiring but the SH code returns, the control board input circuit may be faulty and requires diagnostic equipment and service-level schematics. Technicians have access to manufacturer resistance specs and can test the circuit end-to-end to isolate faults that are not obvious from visual inspection alone.