Bradford White RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining MECH-NO-HOT-WATER Error Fix: No Hot Water — Complete Loss

Error code MECH-NO-HOT-WATER on the Bradford White RE340S6 40 Gallon 4500W Short Electric Water Heater with Glass Lining means: No Hot Water — Complete Loss. The water heater is producing no hot water at all. On electric models, check: Is the circuit breaker tripped? Reset it and wait for recovery. Has the ECO tripped? (Press the red reset button on the upper thermostat.) Is the upper heating element working? (Test for 12-13 ohms resistance.) Is the upper thermostat working? (Test for voltage at the element terminals.) Check for a tripped GFCI breaker or a loose wire connection at the breaker or at the water heater junction box. Verify 240V power at the top of the upper thermostat with a multimeter. A complete loss of hot water on an electric model almost always points to a power problem, tripped ECO, or failed upper element.

The most successful fix is "Test and Replace Thermopile or Dip Tube" (hard difficulty, ~90 minutes). Estimated DIY cost: $15-$40. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Test and Replace Thermopile or Dip Tube") is rated hard difficulty and takes about 90 minutes. Tools needed: Phillips screwdriver, Multimeter, Adjustable wrench.

DIY cost: $15-$40. 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-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-NO-HOT-WATER 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.