OEM vs Aftermarket 303396 High Limit Thermostat for Whirlpool & Maytag: Honest Comparison

Your Maytag MDE7600AYW dryer just tripped the breaker for the third time this week. Or maybe it's running ice-cold, tumbling wet clothes that never actually dry. You've traced it to a failed high limit thermostat — part number 303396. Now you're staring at two options online: an OEM Whirlpool version for $60-$85, or an aftermarket replacement for $28.99. Which one actually works?

I've installed both versions in dozens of Whirlpool, Maytag, Kenmore, and Admiral dryers over the years. Here's what you need to know before you order.

Quick Answer

The aftermarket 303396 thermostat performs identically to OEM in 95% of applications. It uses the same bi-metal disc design, trips at the same 250°F safety threshold, and fits all the same machines. Unless you're dealing with a brand-new dryer still under manufacturer warranty (where using aftermarket parts could void coverage), save the $30-$55 and go aftermarket.

Side-by-Side Comparison

When OEM Makes Sense

There are legitimate situations where paying double for the Whirlpool-branded part is the right call:

Active manufacturer warranty. If your Maytag LDE9304ACE is still covered under the original warranty or an extended service plan, you'll need the OEM part. Service techs dispatched under warranty contracts are required to install manufacturer parts — it's in their contract.

Commercial laundromat equipment. Some commercial lease agreements specify OEM parts only. If you're maintaining coin-op machines in a laundromat setting, check your equipment lease before ordering aftermarket.

Brand loyalty matters to you. Some owners simply prefer everything in their appliance to carry the original manufacturer logo. That's a valid choice — just know you're paying for the logo, not better performance.

When Aftermarket Wins

For most residential repairs, the aftermarket 303396 is the smarter buy. Here's why:

Identical function at half the cost. Both versions use a bi-metal temperature disc that opens the circuit when exhaust temps hit 250°F. I've tested both with a multimeter during live operation — they trip at the exact same temperature threshold. The aftermarket part doesn't "run hotter" or "fail faster" like some forum myths claim.

Better availability. Whirlpool parts depots don't always stock every thermostat. I've waited 8 days for an OEM 303396 to ship from a regional warehouse. The aftermarket version ships same-day from most suppliers, which means your dryer's back in service by the weekend instead of two weeks from now.

Longer warranty coverage. The OEM part comes with a 90-day parts warranty. Heima's aftermarket version includes a full year. If something goes wrong (rare, but possible), you've got four times longer to get a free replacement.

"It's the same part made in a different factory. I've installed hundreds of these in Kenmore and Maytag dryers without a single callback. The OEM markup is pure brand tax."

Fits the same machines. This aftermarket thermostat works in all the same models as OEM: Maytag MDE5500AYW, MDE7400AYW, MDE7600AYW, MDE9206AYW, MDE9606AYW, Whirlpool MDG7600AWW, Kenmore models using the same platform, and dozens more. Check your current thermostat for the 303396 part number stamped on the metal housing — if it matches, the aftermarket version is a direct swap.

Real-World Installation: Both Install Identically

The installation process doesn't change based on which version you buy. You'll disconnect the two spade terminals (usually white wires), remove the mounting screw, pull the old thermostat off the blower housing, and reverse the process with the new one. The aftermarket part has the same mounting hole spacing, same terminal orientation, and same thermal contact surface.

Takes about 15 minutes if you've never done it before, 5 minutes if you have.

Common Failure Scenarios This Part Fixes

Dryer runs but produces no heat. The high limit thermostat is a safety cutoff — when it fails in the open position, the heating circuit stays dead even though the drum spins normally. You'll hear the motor running, see the timer counting down, but clothes come out still damp after a full cycle.

Dryer overheats and trips breakers. Less common, but if the thermostat fails in the closed position (stuck contacts), the heating element stays energized continuously. The dryer gets dangerously hot, might scorch clothes, or trip your home's circuit breaker as a secondary safety.

Both issues require replacing the 303396 thermostat. Neither the OEM nor aftermarket version is more prone to either failure mode — they're both mechanical switches that eventually wear out after thousands of heat cycles.

Our Verdict

Go aftermarket unless warranty requires OEM. The $28.99 Heima 303396 thermostat delivers identical performance, better warranty coverage, and faster shipping than the $60-$85 OEM version. I'd install it in my own mother's dryer without hesitation. Save the $30+ difference for the next repair — because with appliances, there's always a next repair.

Frequently Asked Questions

Will the aftermarket 303396 void my dryer's warranty?

If your dryer is still under active manufacturer warranty, yes — using aftermarket parts can void coverage for related components. However, if your warranty has expired (most are 1 year parts and labor), there's no coverage to void. The Magnuson-Moss Warranty Act prevents manufacturers from voiding warranties solely because you used aftermarket parts, but they can deny claims if the aftermarket part caused the failure. For out-of-warranty machines, it's a non-issue.

Does this replace the cycling thermostat too, or just the high limit?

This is only the high limit safety thermostat — the one that cuts power if the dryer gets dangerously hot. It's different from the cycling thermostat (which regulates normal operating temperature). They're often mounted near each other on the blower housing, so don't mix them up. If your dryer isn't heating at all, you might need both, but start with the high limit since it's the most common failure point.

How do I know if I need part 303396 specifically or a different thermostat?

Pop off your dryer's lower front panel or rear access cover and look at the existing thermostat mounted on the blower housing. The part number is stamped directly on the metal disc housing — it'll say "303396" or one of the cross-reference numbers like "WP303396". If your number matches, you need this part. If you see a different number (like 3387134, 3977767, or 3390291), you've got a different thermostat model that requires a different replacement.