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Navien Error Code 351 Repair in Indianapolis
Navien Error Code 351 indicates the unit has detected abnormal water pressure within the system. This error may be caused by excessive water pressure, pressure fluctuations, faulty sensors, plumbing restrictions, scale buildup, or issues with pressure control devices.
If your Navien tankless water heater is displaying Error Code 351, Hot Water Pros can quickly diagnose the cause and restore reliable hot water service throughout Indianapolis and surrounding communities.
What Does Navien Error Code 351 Mean?
Navien Error Code 351 indicates the control board has detected water pressure readings outside the unit's normal operating range. To protect internal components and ensure safe operation, the system may shut down until the underlying pressure issue is corrected.
Common Causes of Navien Error Code 351
Replace your bullet list with:
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High water pressure
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Failing pressure reducing valve (PRV)
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Water pressure fluctuations
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Expansion tank problems
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Scale buildup inside the heat exchanger
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Dirty inlet filter
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Restricted water flow
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Faulty pressure sensor
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Plumbing restrictions
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Control board communication issues
High water pressure is one of the most common causes of Navien Error Code 351. A failing pressure reducing valve (PRV), waterlogged expansion tank, or pressure fluctuations can cause the unit to shut down and display this error code.
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If your Navien is repeatedly showing Error 351, Hot Water Pros can test your home's water pressure, inspect your PRV and expansion tank, and diagnose the root cause of the problem.
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Call Today: 317-922-9043
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Serving Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, and Zionsville.
Can I Fix Navien Error Code 351 Myself?
Homeowners can safely check:
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Recent plumbing work
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Water shutoff valves
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Water softener bypass settings
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Visible leaks
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Obvious pressure problems at fixtures
However, diagnosing Error Code 351 often requires pressure testing, inspection of the PRV, evaluation of expansion tank performance, and examination of internal tankless components.
Signs You Need Professional Navien Repair
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Repeated Error 351 shutdowns
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Water pressure fluctuations
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Unusually high pressure at fixtures
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Relief valve discharge
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Inconsistent hot water
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Tankless system resets
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No hot water production
Why Indianapolis Homeowners Choose Hot Water Pros
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Licensed Indiana plumbing contractor
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Experienced with Navien tankless systems
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Same-day service available
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Water pressure diagnostics
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Tankless flushing and maintenance
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Upfront pricing
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Serving Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, and Zionsville
Frequently Asked Questions
What is Navien Error Code 351?
Navien Error Code 351 indicates abnormal water pressure has been detected within the system.
Can high water pressure cause Error 351?
Yes. Excessive incoming water pressure is one of the most common causes.
Can a bad PRV cause Error 351?
Yes. A failing pressure reducing valve can allow unsafe pressure levels and trigger the code.
Can scale buildup cause Error 351?
Yes. Mineral buildup may affect flow characteristics and contribute to pressure-related issues.
Locally Owned & Operated
Hot Water Pros proudly provides Navien Error Code 351 repair throughout Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, Cicero, and Zionsville. Our Navien trained technicians can quickly diagnose ignition failures and restore reliable hot water to your home.
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