F09Warning
Speed Queen Dishwasher F09 Error Code
The thermistor (temperature sensor) has failed open or shorted.
Common causes
- Defective thermistor
- Damaged wiring
- Control board fault
How to fix it
- Unplug dishwasher for 1 minute to reset control.
- Check resistance of thermistor (should be ~10k ohms at room temp).
- Inspect wiring for breaks or corrosion.
⚠ When to call a pro: If resistance is out of range, replace thermistor or call technician.
Part links are affiliate links — as an Amazon Associate we may earn a small commission at no extra cost to you.
Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.