Navien Error Code 515: Causes & Repair in Indianapolis
Navien Error Code 515 indicates a communication failure within the unit. This error may be caused by wiring issues, loose electrical connections, control board problems, moisture intrusion, or component communication failures.
If your Navien tankless water heater is displaying Error Code 515, Hot Water Pros can diagnose the issue and restore reliable hot water service throughout Indianapolis and surrounding communities.
QUICK ANSWER
What Navien Error Code 515 Means
Error 515 means the control board has lost communication with one or more components inside the unit. The heater may stop running until the problem is repaired.
Top 3 causes
Loose, corroded or damaged wiring connections
Moisture getting inside the unit
Power fluctuations or a failing control board
When to call a pro
If 515 comes back after a power cycle, or you see water on or in the unit, schedule Navien tankless water heater repair. Older unit with repeat electronic faults? Compare the repair with a new tankless water heater.
BEFORE YOU CALL
Safe Things To Check First
Power cycle: Turn the heater off at its breaker (or unplug it) for about a minute, then turn it back on.
Breaker: If the breaker had tripped, reset it once. If it trips again, leave it off and call.
Look for water: Check for water on or under the unit without touching any wiring. If it's wet, leave the power off and call.
Recent outage: Note any recent power outage or storm. Power fluctuations are a common trigger.
Leave it to a pro: removing the cover and anything involving wiring, connectors or the control board.
Water on the unit? See Navien leaking water. Still showing 515? Call 317-922-9043 or book online.
What Does Navien Error Code 515 Mean?
Navien Error Code 515 indicates the control board has lost communication with one or more critical components inside the unit.
To protect the system, the tankless water heater may stop operating until communication is restored and the underlying issue is repaired.
Common Causes of Navien Error Code 515
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Loose electrical connections
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Damaged wiring harnesses
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Moisture inside the unit
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Faulty control board
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Communication failure between components
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Electrical power fluctuations
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Corrosion on connectors
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Improper installation
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Internal component failure
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Age-related electronic issues
Many Navien Error 515 Issues Are Electrical or Communication Related
Loose wiring, moisture intrusion, power fluctuations, and control board problems can all trigger Error Code 515.
While a simple reset may temporarily clear the code, recurring communication errors often require professional diagnosis.
Hot Water Pros can inspect wiring, test components, and determine whether repairs or replacement parts are needed
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Call Today: 317-922-9043
Can I Fix Navien Error Code 515 Myself?
Homeowners can safely check:
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The circuit breaker
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Power supply to the unit
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Whether the unit recently experienced a power outage
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Visible signs of water intrusion
Most Error 515 conditions require professional diagnosis because the issue often involves internal electronics, communication circuits, or control board components.
Signs You Need Professional Navien Repair
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No hot water
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Repeated Error 515 codes
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Unit will not restart
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Intermittent operation
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Blank or flashing display
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Electrical fault symptoms
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Multiple error codes appearing
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
We Repair All Major Navien Models
Our technicians service all major Navien tankless water heater models including:
• Navien NPE-240A2
• Navien NPE-210A2
• Navien NPE-180A2
• Navien NPE-S2 Series
• Navien NCB Series
• Navien NHB Series
Navien NPE-240A2
199,000 BTU
Navien NPE-210S2
180,000 BTU
Navien NPE-240S2
199,000 BTU
Navien NPE-180A2
150,000 BTU
Navien Error Code 515 Repair FAQs
What is Navien Error Code 515?
Error Code 515 indicates a communication failure between internal components of the unit.
Can a power outage cause Error 515?
Yes. Electrical disturbances can sometimes trigger communication errors.
Does Error 515 mean my control board is bad?
Not necessarily. Wiring, connectors, moisture, and other components can also cause the error.
Will resetting the unit fix Error 515?
Sometimes temporarily, but the root cause usually remains.
How much does it cost to fix Navien Error Code 515?
Repair costs depend on the cause. We provide upfront pricing before any work begins, and warranty coverage is available on qualifying repairs.
Do you repair Navien Error Code 515 in Indianapolis?
Yes. Hot Water Pros provides Navien Error Code 515 diagnosis and repair throughout Indianapolis and surrounding communities, with same-day service available. Call or text 317-922-9043 to schedule.
Locally Owned & Operated
Hot Water Pros proudly provides Navien Error Code 515 repair throughout Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, Cicero, and Zionsville. Our Navien trained technicians can quickly diagnose communication and control board faults and restore reliable hot water to your home.
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