If you're maintaining equipment with Tecumseh compressors—refrigeration units, ice machines, water heaters, even some air compressors like DeWalt—the single most important thing is keep the air filter clean. Dirty filters cause more compressor failures than anything else I've seen in eight years of emergency service calls.
I'm not an engineer, so I can't speak to compressor design details. What I can tell you from field experience is that a $15 air filter replacement saved more customers from a $1,200 compressor swap than any other fix. The Tecumseh 33268 air filter is a common upgrade—it's larger than the stock unit on many models and traps finer particles. Worth the price.
Why Air Filters Matter More Than You Think
Here's what happens: a clogged filter restricts airflow. The compressor runs hotter, works harder, and eventually trips thermal protection—or fails. I still kick myself for missing this on a water heater call in 2023. The customer complained about low output; we checked everything but the filter. Three days later the compressor seized. Total cost? $1,800. A $20 filter would've prevented it.
Bottom line: air filter replacement should be at the top of any maintenance checklist, whether it's a Tecumseh condensing unit, a household water heater with a heat pump, or a commercial ice machine.
Ice Machine Cleaning – More Than Just Scrub
Ice machines—like those from Manitowoc or Scotsman that use Tecumseh compressors—need regular descaling. But a mistake I see often: people clean the evaporator but ignore the condenser coil and air filter. The machine works fine for a month, then slows down again. That's not a cleaning problem; it's an airflow problem.
For how to clean ice machine properly: start with the air filter (check your model—many use a washable one, others use disposable like the 33268). Then clean the condenser coils with a soft brush or low-pressure air. Finally, run a descaling cycle. Don't skip the order.
Water Heater Maintenance with Tecumseh Compressors
Heat pump water heaters (HPWHs) are becoming common, and many use Tecumseh compressors. Maintenance is similar: the air filter on the top intake must be checked every 3 months. I've seen units that lose 40% efficiency just from a dusty filter. Also, the condensate drain can clog—clean it with a pipe cleaner annually.
There's a myth that new water heaters are maintenance-free. That was true 15 years ago when it was a simple electric tank. Today's HPWHs have moving parts and need attention. Ignoring them is like skipping oil changes on a car.
What About DeWalt Air Compressors?
You might be thinking, “This is about Tecumseh, but what about my DeWalt air compressor?” Fair point. DeWalt doesn't use Tecumseh compressors in their cordless models—they use their own. But the same maintenance principle applies: check the intake filter. On most DeWalt units it's a small foam element that costs $5. Clean or replace it every 50 hours of use. And drain the tank daily if you run in humid conditions.
The TCO lesson is the same: a $5 filter saves a $300 pump replacement. Don't learn that the hard way.
Filters and Cross-Reference: Tecumseh 33268 and Beyond
The Tecumseh 33268 air filter is a bestseller for good reason—it fits a wide range of condensing units and ice machines. But it's not universal. If your equipment uses a different size, look up the cross-reference in the Tecumseh parts catalogue. I've seen technicians force a 33268 into a housing that doesn't fit, which defeats the purpose. Use the right part.
If you're ordering online, double-check the dimensions and the OEM numbers. Many generic filters claim compatibility but seal poorly. Paying an extra $2 for the genuine Tecumseh filter is worth it in the long run.
When to Call a Pro
Honestly, most of what I've said you can do yourself: change filters, clean coils, descale. But if the compressor won't start or makes loud rattling sounds, stop. That's beyond basic maintenance. You risk damaging the electrical system or discharging refrigerant—which requires EPA certification. I've taken over too many jobs where a well-meaning homeowner made things worse.
Also, if your water heater heat pump is under warranty, using the wrong filter might void coverage. Always check the manual first.
So here's my final take: start with the air filter. Whether it's a Tecumseh 33268 on an ice machine, a car's cabin filter (yes, an air filter car analogy works here—same concept), or a DeWalt air compressor's foam element, clean air keeps equipment alive. Don't ignore it. Your compressor will thank you—and your wallet will too.
