Why Does My Navien Tankless Water Heater Keep Shutting Off?
A Navien tankless water heater that repeatedly shuts off can leave you without reliable hot water and may indicate an underlying mechanical, electrical, venting, or maintenance issue.
Hot Water Pros provides professional Navien diagnostics and repair throughout Indianapolis and surrounding communities.
QUICK ANSWER
Why Your Navien Keeps Shutting Off
A Navien shuts itself off when it detects a condition it reads as unsafe, such as an ignition, venting, gas or water pressure problem. The code on the display tells you where to start.
Top 3 causes
Ignition or flame loss problems (codes 003 and 012)
Blocked venting or airflow problems (codes 109 and 110)
Scale buildup or a dirty inlet filter from skipped maintenance
When to call a pro
If it shuts off again after one reset, or you need frequent resets to keep hot water, schedule Navien tankless water heater repair. Repeat shutdowns usually mean the root cause hasn't been fixed.
BEFORE YOU CALL
Safe Things To Check First
Read the code: Write down the code on the display and open its guide: 003, 012, 109, 110, 351 or 515.
Outside vents: Clear snow, ice, leaves or nests from the intake and exhaust openings you can reach safely.
Valves and power: Make sure the water and gas valves to the heater are open and the breaker hasn't tripped. If a gas valve is off and you don't know why, call us first.
Maintenance: No descaling in the past year? Scale may be the cause. Our Carefree tankless plan includes annual service.
Leave it to a pro: gas lines, burner parts, wiring and anything under the cover.
Still shutting off? Call 317-922-9043 or book online.
Common Reasons A Navien Keeps Shutting Off
Several problems can cause repeated shutdowns:
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Ignition failures
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Flame loss
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Gas supply issues
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Venting restrictions
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Airflow problems
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Scale buildup
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Dirty filters
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Low water pressure
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High water pressure
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Electrical faults
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Control board issues
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Condensate drainage problems
Error Codes Often Associated With Repeated Shutdowns
Common error codes include:
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Error 003
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Error 012
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Error 109
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Error 110
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Error 351
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Error 515
Repeated shutdowns often occur when the unit detects a condition that could affect safe operation.
Can I Troubleshoot The Problem Myself?
Homeowners can safely check:
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Gas shutoff valves
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Water supply valves
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Circuit breaker position
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Exterior intake and exhaust vents
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Visible condensate drainage issues
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Error code display
If shutdowns continue, professional diagnosis is recommended.
Warning Signs Of A Larger Problem
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Frequent system resets
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Intermittent hot water
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Error codes
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Reduced water flow
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Strange noises
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Water leaks
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Long delays before hot water arrives
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Unit shuts down during use
Repeated Shutdowns Usually Mean The Underlying Problem Has Not Been Fixed
Many homeowners temporarily restore hot water by resetting their Navien, only to experience the same shutdown again days later. Repeated shutdowns often indicate ignition, venting, pressure, or maintenance-related problems that require proper diagnosis.
Hot Water Pros can identify the root cause and help prevent future interruptions.
Call Today: 317-922-9043
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 Tankless Keeps Shutting Off FAQs
Why does my Navien keep shutting off?
Common causes include ignition problems, vent restrictions, water pressure issues, electrical faults, and maintenance-related problems.
Can scale buildup cause repeated shutdowns?
Yes. Heavy scale buildup can affect heat transfer and system performance.
Can a dirty filter cause shutdowns?
Yes. Restricted flow can create operating issues and trigger faults.
Will resetting my Navien solve the problem?
Sometimes temporarily, but recurring shutdowns usually indicate an underlying issue.
How much does it cost to fix a Navien that keeps shutting off?
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 water heaters that keep shutting off in Indianapolis?
Yes. Hot Water Pros provides diagnosis and repair for Navien tankless water heaters that keep shutting off 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 repair throughout Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, Cicero, and Zionsville. Our Navien trained technicians can quickly diagnose tankless water heaters and restore reliable hot water to your home.
TANKLESS WATER HEATER SERVICES
WE INSTALL. WE SERVICE. WE GUARANTEE.
From installation to maintenance and repairs, we handle all your tankless water heater needs with honest pricing, expert workmanship, and the best brands in the industry.
Professional installation of tankless water heaters for maximum performance and efficiency.
Professional replacement of tankless water heaters for maximum performance and efficiency.
Fast diagnostics and expert repairs to keep your tankless water heater running like new.
Extend the life of your unit and maintain peak performance with professional tankless flushing and cleaning.
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What Our Customers Say
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