Rheem Water Heater Error Code 24: How to Fix It
Hard 2-4 hours High Severity
Verified June 2026
- Error Code
- 24
- Brand
- Rheem
- Product Type
- water_heater
- Severity
- High
- DIY Difficulty
- Hard
- Estimated Fix Time
- 2-4 hours
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Tools You'll Need
- Screwdriver set
- Multimeter
- Work gloves
- Flashlight
- Camera or smartphone
How to Fix Error Code 24
-
Turn Off Power and Gas Supply
Never attempt repairs on a gas appliance without first shutting off gas and power. Gas leaks can cause explosions or carbon monoxide poisoning. -
Remove Access Panel
Ensure the unit has been off for at least 30 minutes to allow internal components to cool down before touching. -
Inspect the Combustion Fan Motor
-
Test Motor Power Supply
Use extreme caution when testing live circuits. Ensure multimeter leads are properly insulated and keep hands dry. -
Check Motor Continuity
-
Clean or Replace Motor
Only use manufacturer-approved replacement parts. Incorrect parts can cause unsafe operation. -
Reassemble and Test
If error persists after motor replacement, discontinue use and contact a licensed technician as there may be additional control system issues.
Parts You May Need
Combustion fan motor assembly
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Wire nuts
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Electrical tape
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Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
Combustion fan motor assembly
Check Price on Amazon
Wire nuts
Check Price on Amazon
Electrical tape
Check Price on Amazon
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When to Call a Professional
Call a licensed HVAC technician if you're uncomfortable working with gas appliances, if the error persists after motor replacement, if you smell gas at any point, or if the control board also needs replacement. Gas water heater repairs often require permits and professional installation to maintain warranty and safety compliance.Frequently Asked Questions
What causes Rheem error code 24?
Error code 24 is caused by combustion fan motor failure, which can result from normal wear, electrical issues, debris buildup, or motor bearing failure. The fan is essential for proper ventilation during combustion.
Can I reset Rheem error code 24?
While you can reset the error by cycling power, code 24 will return immediately if the combustion fan motor is truly failed. This error requires actual repair or replacement of the faulty motor.
How much does it cost to fix error code 24?
DIY motor replacement typically costs $100-250 for the part. Professional repair usually runs $300-600 including labor. Cost varies by model and local labor rates.
Is it safe to use my water heater with error code 24?
No, never operate a gas water heater with error code 24. The combustion fan failure prevents proper ventilation, creating serious safety risks including carbon monoxide poisoning and potential fire hazards.
How long do Rheem combustion fan motors last?
Combustion fan motors typically last 8-12 years with proper maintenance. Regular cleaning and prompt repair of issues can extend motor life, while poor ventilation or electrical problems can cause premature failure.