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A.O. Smith · ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning

A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning E3 Error Fix: Dry Fire Protection Activated

The dry fire protection system has activated, indicating a heating element was energized while not fully submerged in water. This is a safety feature that prevents element burnout and tank damage. The most common cause is powering on the water heater before the tank is completely filled with water. Ensure the tank is full — open a hot water faucet and wait for a steady stream of water (no air sputtering). Press the reset button (red button) on the upper thermostat. If the issue persists, check for a stuck-open T&P relief valve or significant leak.

High severity2 fixes available✨ Free fix available

Quick Answer

Error E3 on the A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning means: Dry Fire Protection Activated. The top-ranked community fix is “Inspect and Replace Faulty Temperature & Pressure Relief Valve or Repair Leaks” (medium difficulty, ~60 min, DIY cost: $15-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · water heater

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many water heater repairs can be done safely at home, consider hiring a qualified technician if:

This is a high severity error — continued use may cause damage or a safety hazard
The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$180.

Other A.O. Smith Models with Error E3

EJCT-50 Elec Lowboy 50 Gal 4500W Lowboy Electric Water Heater

water_heater · 2 fixes

Other A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning Error Codes

Upper Temperature Sensor Failure

2 fixes

Lower Temperature Sensor Failure

2 fixes

High Limit (ECO) Tripped

2 fixes

Heating Element Failure

2 fixes

People Also Ask About A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning Error E3

What does error code E3 mean on a A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning?

Error code E3 on the A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning means: Dry Fire Protection Activated. The dry fire protection system has activated, indicating a heating element was energized while not fully submerged in water. This is a safety feature that prevents element burnout and tank damage. The most common cause is powering on the water heater before the tank is completely filled with water. Ensure the tank is full — open a hot water faucet and wait for a steady stream of water (no air sputtering). Press the reset button (red button) on the upper thermostat. If the issue persists, check for a stuck-open T&P relief valve or significant leak.

How do I fix error code E3 on my A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning?

The most successful fix is "Inspect and Replace Faulty Temperature & Pressure Relief Valve or Repair Leaks" (medium difficulty, ~60 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code E3 on a A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning serious?

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

Can I fix A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning error E3 myself?

Yes — the top-ranked community fix ("Inspect and Replace Faulty Temperature & Pressure Relief Valve or Repair Leaks") is rated medium difficulty and takes about 60 minutes. Tools needed: Adjustable wrench, Garden hose, Pipe thread sealant.

How much does it cost to repair A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning error E3?

DIY cost: $15-$30. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning have?

The A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning has 4 other known error codes, including: E1 (Upper Temperature Sensor Failure), E2 (Lower Temperature Sensor Failure), E4 (High Limit (ECO) Tripped), E5 (Heating Element Failure).

Which other A.O. Smith models have the E3 error?

Error code E3 also appears on 1 other A.O. Smith model: EJCT-50 Elec Lowboy 50 Gal 4500W Lowboy Electric Water Heater. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning have?

The A.O. Smith ENS-50 ProMax Electric 50 Gal 4500W ProMax Electric Water Heater with Self-Cleaning has 4 other known error codes:

E1 — Upper Temperature Sensor Failure (2 fixes)
E2 — Lower Temperature Sensor Failure (2 fixes)
E4 — High Limit (ECO) Tripped (2 fixes)
E5 — Heating Element Failure (2 fixes)

Which other A.O. Smith models have the E3 error?

Error code E3 also appears on 1 other A.O. Smith model:

EJCT-50 Elec Lowboy 50 Gal 4500W Lowboy Electric Water Heater (water heater) · 2 fixes

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