Kenmore Dishwasher Thermostat Replacement Guide

Before you order a part, separate two components that people constantly confuse. The hi-limit thermostat is a safety cutoff that physically breaks the heater circuit when the tub gets too hot. The thermistor is a sensor that streams a temperature reading to the control board. They fail differently and produce different symptoms, so the fix depends on which one is at fault. LG-built (722-prefix) Kenmore Elite models often skip the separate disc entirely and handle temperature limiting inside the board and thermistor, which changes the repair path completely.

No heat vs. overheating#

A bi-metal hi-limit should read closed (continuity) at room temperature and open only when it gets hot. So the test is simple: disconnect power, pull the lower kickplate, unplug one lead, and probe the disc on continuity. If it reads open cold, it has tripped. If it reads closed cold, warm it gently with a hair dryer — a good disc opens at its rated temperature. One that never opens has welded closed and must be replaced. If instead the machine will not heat at all but the disc tests good, shift your attention to the thermistor and the heating element, which produce the same cold-dishes symptom.

Replacing the disc (665 platform)#

1. Kill power at the breaker.
2. Remove the lower kickplate panel (two Phillips #2 screws).
3. Find the small round disc on the tub bottom or sump housing near the element terminals — it has two wire connections.
4. Unplug both leads and release the single mounting screw or clip.
5. Seat the new thermostat flush against the tub so it senses temperature accurately, reconnect, and refit the kickplate.
6. Restore power and run a heated cycle; confirm the water heats and the element cycles off on its own.

Tools: Phillips #2, a multimeter, and a 1/4-inch nut driver. Total hands-on time is usually 15 to 25 minutes. A Whirlpool platform thermostat carries a W10/WP part number, and buying that OEM number directly instead of the Kenmore-branded equivalent typically saves 30–40%.

When it keeps tripping#

If a fresh thermostat trips again, the disc is not the root cause. A partially shorted heating element draws too long and overheats locally, or restricted water circulation creates a hot zone. Chasing thermostats will not fix either — inspect the element and flow first. On the Whirlpool platform, a heating-related complaint sometimes rides alongside an F1 E1 control-board code or an F8 fill fault, which points you away from the disc and toward the board or inlet.

Keeping it healthy#

Set your home water heater so the dishwasher receives water around 120°F — feeding it scalding water forces the heater and thermostat to work in an already-elevated range. Keep the element free of scale, since scale creates hot spots that trip the disc prematurely, and run a descaling cycle quarterly in hard-water areas. Do not crowd the tub with oversized items that block circulation and create localized hot zones. Bi-metal discs are simple mechanical parts with no electronics, so a well-maintained one commonly lasts 10 to 20 years — and if yours tripped once from an obvious cause like a blocked vent, a resettable model may recover, but a disc that trips repeatedly should be replaced.