Rinnai Tankless Water Heater Error Code 24: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 24
- Brand
- Rinnai
- Product Type
- water_heater
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Philips screwdriver
- Multimeter
- Soft brush
How to Fix Error Code 24
-
Power Cycle the Water Heater
Ensure power is off before proceeding. -
Check for Loose Connections
Disconnect power before removing covers. -
Inspect the Servo Motor
-
Test the Servo Motor with a Multimeter
Ensure power is off before testing. -
Replace the Servo Motor
Turn off gas supply and power before servicing gas components.
Parts You May Need
Rinnai Servo Motor
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Rinnai Servo Motor
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Rinnai Servo Motor
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Rinnai Servo Motor
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When to Call a Professional
If the error persists after replacing the servo motor, the control board may be faulty, requiring a professional technician. Also, if you're uncomfortable working with gas components, call a licensed plumber or HVAC technician.Frequently Asked Questions
What does error code 24 mean on a Rinnai water heater?
It indicates a servo motor fault. The servo motor controls the gas valve, and the error means it's not functioning correctly.
Can I reset a Rinnai error code 24?
Yes, by turning off the power for 60 seconds and turning it back on. However, if the fault persists, further troubleshooting is needed.
How much does it cost to fix Rinnai error code 24?
DIY replacement of the servo motor costs around $50-$100 for the part. Professional repair may cost $200-$400 including labor.
Is it safe to use my Rinnai water heater with error code 24?
No, error 24 may prevent proper gas flow, leading to unsafe operation. Do not use the heater until the issue is resolved.
What tools do I need to fix error code 24?
You'll need a Phillips screwdriver, a multimeter, and possibly a soft brush for cleaning.