Ariens Deluxe 28 SHO Snow MECH-SPARK-PLUG Error Fix: Fouled or Worn Spark Plug

Error code MECH-SPARK-PLUG on the Ariens Deluxe 28 SHO Snow means: Fouled or Worn Spark Plug. The spark plug is fouled with carbon deposits, oil, or fuel, or the electrode is worn, causing weak or no spark. Remove the spark plug and inspect it. A black, sooty plug indicates a rich fuel mixture or choke stuck closed. An oily plug suggests worn piston rings. A white plug indicates overheating. Replace the spark plug if the electrode gap is out of specification or the electrode is worn. Use the correct spark plug type and gap specified in the Ariens owner's manual. Spark plugs should be replaced annually as preventive maintenance.

The most successful fix is "Replace Spark Plug and Perform Engine Tune-Up" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Spark Plug and Perform Engine Tune-Up") is rated medium difficulty and takes about 45 minutes. Tools needed: Spark plug socket (5/8 inch), Ratchet wrench, Feeler gauge, Screwdrivers, Carburetor cleaner spray.

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Ariens Deluxe 28 SHO Snow has 8 other known error codes, including: MECH-AUGER (Auger Won't Turn or Engage), MECH-BELT (Belt Slipping, Worn, or Broken), MECH-CARBURETOR (Carburetor Gummed or Clogged), MECH-CHUTE (Chute Won't Rotate or is Stuck), MECH-DRIVE (Won't Self-Propel or Move Forward), and 3 more.

Error code MECH-SPARK-PLUG also appears on 5 other Ariens models: Ariens Deluxe 24 254cc 24 in. 2-Stage Gas Snow Blower, Ariens Professional 28 420cc 28 in. 2-Stage Gas Snow Blower, Compact 24 208cc 24 in 2-Stage Gas Snow Blower with 208cc Engine, Path-Pro 208 208cc 28 in 2-Stage Gas Snow Blower with Electric Start, Platinum 24 SHO Snow. The fix may vary by model, so check each model's specific page for tailored repair steps.