Universal Bimetal Thermostat Parts — Multi-Brand Appliance Compatibility

Last week, a customer called because their Maytag dryer wouldn't shut off — it just kept running until they manually unplugged it. The culprit? A failed KSD301A-A bimetal snap disc thermostat. This universal thermal cutoff is one of those parts you'll find across multiple brands and appliance types, from dryers to microwaves to coffee makers. When it fails, you'll typically notice your appliance running too hot, refusing to shut off, or taking forever to complete a cycle.

Is This the Right Part for Your Model?

The KSD301A-A is a universal replacement that's compatible with dozens of brands including Whirlpool, Maytag, GE, Samsung, LG, Frigidaire, and Kenmore. Your model number is usually stamped on a metal plate inside the door frame (for dryers) or behind the front panel (for microwaves). Cross-reference your model with our compatibility list below — this thermostat replaces KSD301, KSD302, and KI31 variants.

About This Replacement Part

The KSD301A-A is a thermal safety device that monitors temperature and cuts power when things get too hot. It's designed to prevent overheating damage and potential fire hazards. One common issue we see is when the blower wheel warps and starts rubbing on the cover — this creates extra heat that can trip the thermostat prematurely or cause it to fail entirely. Users report hearing a "loud rubbing noise" right before the thermostat gives out. The good news? This is an easy fix that most people complete in 30-60 minutes with basic hand tools.

What You'll Need for Installation

Grab your screwdrivers, socket set, pliers, and nut drivers. You'll need to access the rear panel on dryers or the interior cavity on microwaves. The thermostat typically mounts with two screws and connects via push-on terminals — no soldering required. As one DIYer put it: "I watched the very, very helpful video that was available. It was so very helpful and made the job very easy."

Common Failure Symptoms

• Appliance runs too hot: Temperature exceeds normal operating range
• Won't shut off: Continues running past the end of cycle
• Takes too long to dry: Cycles extend 2-3x normal duration
• Intermittent operation: Starts and stops randomly during use

Compatible Models

This universal thermostat fits appliances across multiple categories. Here are the most common compatible models:

• MCO165UB (Magic Chef) — Microwave
• WED5000DW0 (Whirlpool) — Electric Dryer
• MEDC400VW0 (Maytag) — Electric Dryer
• DV42H5000EW (Samsung) — Electric Dryer
• DLGX3471W (LG) — Gas Dryer
• FFRE4120SW (Frigidaire) — Range
• 110.70022011 (Kenmore) — Electric Dryer
• JVM3160RFSS (GE) — Microwave
• WMH31017AS (Whirlpool) — Microwave
• MDE9700AYW (Maytag) — Electric Dryer
• MDG9700AWW (Maytag) — Gas Dryer
• MDE9700AYM (Maytag) — Electric Dryer
• MDE6700AYW (Maytag) — Electric Dryer
• NED7200TW10 (Maytag) — Electric Dryer
• NGD7200TW1 (Maytag) — Gas Dryer

Installation Tips

Always disconnect power before starting. Take a photo of the wire connections before removing the old thermostat — it'll save you headaches during reassembly. The terminals should slide on firmly with a slight click. If they're loose, carefully crimp them for a tighter fit. Test your appliance on a short cycle before fully reassembling the panels.