Product review (5 stars): Resolved F24 Error in Duet Sport ht
My Whirlpool Duet Sport ht stopped at an unknown point in the wash cycle, displayed F24 error code, and left saturated clothes in the locked washer. It allowed me to cancel and run a rinse/spin cycle. It also would run a full cycle using cold water.

According to Whirlpool's diagnostic guide attached inside the lower front panel (also available on-line), F24 is a water temperature sensor error, and could also mean an open heating element (infinite resistance). Comments at various web sites suggest a loose sensor connector or broken sensor wire is a common cause of this error. Others suggest unplugging the machine for 30 minutes and seeing if that clears the error.

There is conflicting information on the web about the location of the sensor for Duet Sport ht. On my WFW8500SR00, it's in the back, near the bottom, and obvious once you remove the back panel. Of course, you will unplug the washer before opening it up.

My time was limited, as is the space in my ridiculously-tiny laundry room. If I'm going to bend my no-longer 20-year-old body into the shapes required to get behind the washing machine, it's not going to be just for checking loose wires. I'm going to have whatever parts I'm likely to need if the wires are OK, so if I can successfully extricate myself, I only have to do it once, even if it means I buy spare parts I'll never use.

There are two back panels, with the small upper one overlapping the lower. The top panel doesn't have to be removed -- just use a 1/4" nut driver to remove the screws holding the lower panel, including the row of screws common to both panels; the lower panel slides down. The plastic hose holder can stay. The panel has notches around some screws -- those screws stay.  Two screws are in indentations. I suggest removing them last, and reinstalling them first, because they hold the panel on pretty well by themselves. The screw on the very bottom center is easy to miss.

One of the on-line videos shows prying out the heater/sensor assembly. I didn't do that. Instead, I squeezed the temp sensor connector with my fingers and gently pulled it off, then used ordinary 6" slip-joint pliers to slowly rock the sensor out toward me. It didn't come easily, because the part exposed to water was coated with mineral deposits (our water is neither hard nor soft). I rubbed some automotive rubber lubricant on the new sensor, and it slid right into the rubber gasket that holds it  -- soapy water would have worked just as well. I found no loose or broken wires. Without disconnecting any wires, I tested the heating element with an ohmmeter -- it was a healthy 15 ohms.

Amazon's tool reported it didn't know whether this sensor fits my washer. It does, and other sites listed it as a match. I received a genuine Whirlpool part. Vendor was Amazon.