Bradford White RE350T6 50 Gallon 4500W 6-Year Warranty Upright Electric Water Heater MECH-SEDIMENT Error Fix: Sediment Buildup — Popping Noise or Reduced Efficiency

Error code MECH-SEDIMENT on the Bradford White RE350T6 50 Gallon 4500W 6-Year Warranty Upright Electric Water Heater means: Sediment Buildup — Popping Noise or Reduced Efficiency. Mineral sediment (calcium, lime, sand) has accumulated on the bottom of the tank and on the heating elements, causing popping or sizzling noises and reduced heating efficiency. On electric water heaters, sediment coats the elements and insulates them — the element overheats trying to transfer heat through the scale, eventually burning out. Flush the tank by connecting a garden hose to the drain valve and draining several gallons. For heavy buildup, do a full drain. To clean elements, turn off power and remove the elements — soak in a vinegar solution to dissolve scale. Prevent buildup by flushing annually. In hard water areas, consider a whole-house water softener.

The most successful fix is "Perform Full Drain and Replace Anode Rod if Needed" (medium difficulty, ~90 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Perform Full Drain and Replace Anode Rod if Needed") is rated medium difficulty and takes about 90 minutes. Tools needed: Garden hose, 1-1/16 inch socket wrench, Adjustable wrench, Gloves, Safety glasses.

DIY cost: $15-$30. Professional repair typically costs $180-$250. Many homeowners save money by trying the top-ranked community fix first.

The Bradford White RE350T6 50 Gallon 4500W 6-Year Warranty Upright Electric Water Heater has 8 other known error codes, including: MECH-ANODE (Anode Rod Depleted — Rotten Egg Smell or Corrosion), MECH-ECO-TRIP (ECO (Energy Cut Off) Tripped — Red Reset Button), MECH-ELEMENT-LOWER (Lower Heating Element Failed), MECH-ELEMENT-UPPER (Upper Heating Element Failed), MECH-INSUFFICIENT-HOT (Not Enough Hot Water — Runs Out Quickly), and 3 more.

Error code MECH-SEDIMENT also appears on 8 other Bradford White models: D-W-2-75T6BN Ultra Low NOx, MI50S6BN 50 Gallon 76,000 BTU Magnum Series Commercial Natural Gas Water Heater, MI50T6FBN 50 Gallon 40,000 BTU Natural Gas Magnum Commercial Water Heater, RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining, RG240T6N eF Series, RG250T6N 50 Gallon 40,000 BTU 0.67 EF Defender Safety System Gas Water Heater, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.