Rinnai Tankless Water Heater Error Code 58: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 58
- 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
- Multimeter
- Phillips screwdriver
- Flathead screwdriver
- Rags (optional)
How to Fix Error Code 58
-
Turn Off Power and Gas
Never work on electrical components while power is connected. Gas leaks are hazardous; if you smell gas, evacuate and call a professional. -
Access the Solenoid Valve Assembly
-
Inspect Wiring for Solenoid 4
Use proper electrical safety: ensure power is off before touching wires. -
Test Solenoid Valve 4 Resistance
-
Replace Solenoid Valve Assembly if Faulty
Always use manufacturer-approved replacement parts to ensure safety and warranty compliance. -
Reassemble and Test
Parts You May Need
Rinnai Gas Solenoid Valve Assembly
Check Price on Amazon
Rinnai Gas Solenoid Valve Assembly
Check Price on Amazon
Rinnai Gas Solenoid Valve Assembly
Check Price on Amazon
Rinnai Gas Solenoid Valve Assembly
Check Price on Amazon
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When to Call a Professional
If the wiring and solenoid check out fine but error 58 persists, the control board may be damaged. For any gas line work or if you're uncomfortable with electrical troubleshooting, call a licensed HVAC technician or Rinnai service provider.Frequently Asked Questions
What does error code 58 mean on a Rinnai water heater?
Error code 58 means there is a short circuit in solenoid valve 4, which controls gas flow. This prevents the heater from lighting.
Can I fix Rinnai error 58 myself?
If you are comfortable with electrical testing and simple part replacement, yes. Otherwise, hire a professional.
How much does it cost to replace a Rinnai solenoid valve?
The part costs around $50-$150, plus labor if you hire a technician. DIY saves on labor costs.
Will error 58 clear after replacing the solenoid?
Yes, replacing the faulty solenoid typically clears the error. If it doesn't, the control board may be damaged.
How do I find solenoid valve 4 on my Rinnai heater?
Solenoid valves are arranged in order on the gas manifold. Solenoid 4 is usually the fourth from one end. Check your unit's wiring diagram for exact location.