Navien Tankless Water Heater Error Code 047: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
047
Brand
Navien
Product Type
water_heater
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 047 on your Navien tankless water heater indicates the burner cabinet fan is stuck or not spinning properly. This fan is essential for expelling exhaust gases and ensuring safe operation. Follow these steps to diagnose and resolve the issue.
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Tools You'll Need

How to Fix Error Code 047

  1. Turn Off Power and Gas

    Always turn off power and gas before working on the water heater to prevent electrical shock or gas leaks.

  2. Access the Fan

  3. Check for Obstructions

    Be gentle to avoid damaging the fan blades.

  4. Test Fan Spin

  5. Check Wiring Connections

  6. Measure Voltage at Fan (Advanced)

    This step involves working with live electricity. If uncertain, skip and call a professional.

  7. Replace the Fan if Necessary

    Ensure replacement fan matches your specific Navien model.

Parts You May Need

Burner cabinet fan motor
Check Price on Amazon
Burner cabinet fan motor
Check Price on Amazon
Burner cabinet fan motor
Check Price on Amazon
Burner cabinet fan motor
Check Price on Amazon
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When to Call a Professional

If the fan still doesn't run after replacing it, or if you are uncomfortable working with gas or electrical components, contact a licensed HVAC technician or Navien service professional.

Frequently Asked Questions

Can I still use hot water with error 047?
No. The unit will not operate with this error to prevent unsafe exhaust buildup. You must fix the fan before using the heater.
What causes error 047 on a Navien water heater?
Common causes include a blocked or stuck fan, debris in the venting, faulty fan motor, or a wiring issue.
How do I reset a Navien error 047?
After addressing the fan issue, some models reset automatically when the problem is resolved. You can also turn off the power for 30 seconds and then restore it.
Is it safe to clean the fan myself?
Yes, as long as you turn off power and gas first. Use a soft brush or compressed air and avoid bending the blades.
Can a bad control board cause error 047?
Yes, if the board is not sending power to the fan, the error may appear. A professional can test the board voltage.

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