Rheem Rheem Performance 40 Gal. 4500-Watt 6-Year Tank Electric Water Heater NO HOT WATER Error Fix: No Hot Water — Complete Failure

Error code NO HOT WATER on the Rheem Rheem Performance 40 Gal. 4500-Watt 6-Year Tank Electric Water Heater means: No Hot Water — Complete Failure. The electric water heater produces no hot water at all. This basic electric water heater has NO electronic controls, NO display, and NO error codes — it uses simple mechanical thermostats and heating elements. Diagnostic steps: (1) Check the circuit breaker — should be a dedicated 30-amp double-pole breaker. Reset if tripped. (2) Press the red reset button (ECO / Energy Cut Off) on the upper thermostat — access by removing the upper access panel cover and pulling back the insulation. If the ECO has tripped, press the red button to reset. Note: a tripped ECO may indicate a more serious problem (faulty thermostat, grounded element). (3) If the ECO has NOT tripped and the breaker is ON, test both heating elements with a multimeter for continuity (disconnect power first). Elements should read approximately 12-13 ohms for a 4500W/240V element. An open reading (OL / infinite) means a burned-out element. (4) Test both thermostats for proper switching with a multimeter.

The most successful fix is "Replace Thermopile Assembly to Maintain Pilot Flame" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Replace Thermopile Assembly to Maintain Pilot Flame") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Adjustable wrench.

DIY cost: $15-$25. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Rheem Rheem Performance 40 Gal. 4500-Watt 6-Year Tank Electric Water Heater has 5 other known error codes, including: ECO TRIPPING (High-Limit Reset Button Keeps Tripping), ELEMENT SCALE (Heating Element Scale and Sediment Buildup), INSUFFICIENT HOT (Runs Out of Hot Water Too Quickly), LEAKING (Water Heater Leaking), RUMBLING (Rumbling, Popping, or Banging Noises).

Error code NO HOT WATER also appears on 1 other Rheem model: Rheem Professional Classic 50 Gal. 38,000 BTU Natural Gas Water Heater. The fix may vary by model, so check each model's specific page for tailored repair steps.