Bradford White RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining MECH-ANODE Error Fix: Anode Rod Depleted — Rotten Egg Smell or Corrosion

Error code MECH-ANODE on the Bradford White RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining means: Anode Rod Depleted — Rotten Egg Smell or Corrosion. The sacrificial anode rod inside the tank has been consumed by corrosion, leaving the tank vulnerable to rust. Bradford White uses magnesium anode rods by default. A depleted anode can cause two problems: 1) Tank corrosion — without the anode, the steel tank liner corrodes, shortening tank life. 2) Rotten egg (hydrogen sulfide) smell — bacteria in the water react with the magnesium anode to produce sulfur gas. To fix the smell, replace the magnesium anode with an aluminum/zinc anode rod. Inspect the anode every 3-5 years by removing it from the hex-head fitting on top of the tank — replace when more than 50% consumed. The anode is the primary defense against tank corrosion.

The most successful fix is "Replace the Anode Rod with Aluminum/Zinc Type" (medium difficulty, ~60 minutes). Estimated DIY cost: $40-$60. 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 ("Replace the Anode Rod with Aluminum/Zinc Type") is rated medium difficulty and takes about 60 minutes. Tools needed: 1-1/16 inch socket wrench, Adjustable wrench, Garden hose.

DIY cost: $40-$60. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Bradford White RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining has 8 other known error codes, including: 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), MECH-LEAK (Tank Leaking from Bottom), and 3 more.

Error code MECH-ANODE 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, RE350T6 50 Gallon 4500W 6-Year Warranty Upright Electric Water Heater, 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.