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[![Mountain Man Plumbing Van Side View - Plumbing Services Salt Lake City](<https://mtnmanplumbing.com/wp-content/uploads/2025/05/496938532_122128793642752743_2710524130053362830_n.jpg>) In their own words **Customer reviews.** Hear from the people who hired us. **↗**](<https://mtnmanplumbing.com/reviews/?agentnet=md>)\n  - [FAQ Before you book **Good questions.** Booking, pricing & service areas. **↗**](<https://mtnmanplumbing.com/faq/?agentnet=md>)\n- [Financing](<https://mtnmanplumbing.com/financing/?agentnet=md>)\n- [Second opinion](<https://mtnmanplumbing.com/instant-second-opinion/?agentnet=md>)\n\n- [&gt;\\_ Plain text](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/?agentnet=md>)\n\nMOUNTAIN MAN RADIO  15 originals · All Mountain Man\n\n- [Water heater help](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n\n /  Tankless error codes\n\nTankless error code\n\n# Tankless error code? Give us the model. Let’s figure it out.\n\nMatch the displayed code and full model number to the manufacturer’s troubleshooting guide.\n\nThe code identifies a detected condition. Use the model’s diagnostic procedure to find its cause.\n\n[Look up this model’s code](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/#wha-inline-tool>)\n\nTankless water heater being tested after installation in West Jordan\n\nWest Jordan field photo · Tankless testing and equipment identification\n\nTankless error code\n\n## Error code on your tankless? Let’s find out what it means.\n\nChoose the brand, copy the full model number from the label, and enter the code exactly as shown. We’ll match all three before we show an answer.\n\nManufacturer   Exact model   Code exactly as displayed   Serial  optional\n\nRecord the fault details\n\n## Save the code and the factory label.\n\nThe display supplies the error code, and the rating label identifies the model and generation. Together they lead to the matching explanation in the manufacturer’s manual.\n\nWhat the code can tell you\n\n## Use the code to guide the next checks.\n\nThe timing of the fault and a few measurements are what turn the code into a diagnosis.\n\n### Photograph the display\n\nGet the code and any symbols beside it. The display may clear after a reset or power interruption.\n\n### Photograph the factory label\n\nThe label confirms the full model, serial number, fuel, and the correct set of manufacturer instructions.\n\n### Tell us when the code appears\n\nDoes it show up at startup, during a long shower, when several fixtures run, or only once in a while?\n\nField note · West Jordan\n\n## The logo said State. The label told us which State heater.\n\nOne brand can have several generations with different sensors, controls, and code tables. The full model suffix on the rating plate is what gets us to the right manual and the right checks.\n\nTankless water heater being tested in West Jordan\n\nMatch the code to the full model number.\n\nState tankless water heater installed in West Jordan\n\nInclude the suffix printed on the factory label so the lookup can select the correct equipment family.\n\nLearn from the sequence\n\n## Where did heating stop?\n\nThe useful question after a code lookup is what the heater was trying to do. Preserve the code and operating conditions before any permitted reset erases evidence.\n\nFollow the operating sequence to locate the failed step\n\n| Stage | Normal purpose | A technician’s next question |\n| --- | --- | --- |\n| Water demand | The flow sensor detects water moving through the unit. | Does measured flow agree with the control’s reading? Is it above this model’s starting threshold? |\n| Air movement | The fan establishes the required combustion airflow. | Are the air and exhaust paths correct and unobstructed? What does the model’s diagnostic procedure require? |\n| Ignition and flame confirmation | The control starts combustion and checks that flame is established. | Was fuel delivered under load, and did ignition and flame detection behave as specified? |\n| Temperature control | The heater adjusts fuel input as flow and temperature change. | Do temperature readings and delivered flow make sense together? Is there a restriction or mixing problem? |\n| Shutdown | The control ends combustion when that demand ends. | Is the remaining activity a normal post-purge, recirculation or freeze-protection function? |\n\n**For the homeowner:** save the exact code, full model, time and what was running. Note whether every fixture is affected and whether the unit was already heating. Leave gas-pressure, combustion, vent and internal electrical testing to the technician.\n\n### Technician reasoning: an ignition fault has several possible causes\n\nFor an ignition fault, the technician follows the startup sequence: air movement, fuel delivery, ignition and flame detection. Measurements at the step that fails narrow the cause and show which component needs attention.\n\n [Follow those parts in the tankless explorer →](<https://mtnmanplumbing.com/water-heater-repair/#whr-tankless>) [Navien NPE-240S2: model manuals and drawings ↗](<https://www.navieninc.com/products/npe-240s2/downloads>)\n\n### Where these explanations come from\n\nRead the manufacturer and technical references behind this lesson. For service settings, open the manual for your full model number.\n\n- [Navien NPE-2 owner’s manual: maintenance and troubleshooting ↗](<https://www.navieninc.com/downloads/npe-2-user-s-information-manual-en/download>)\n- [Navien NPE-240S2: model manuals and drawings ↗](<https://www.navieninc.com/products/npe-240s2/downloads>)\n\nCommon questions\n\n## What to know before the code disappears.\n\n### Why do you need the exact model number?\n\nManufacturers reuse code numbers and change their meaning between product families. The model keeps the answer tied to the correct manual.\n\n[Link to this answer](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/#answer-why-do-you-need-the-exact-model-number>)\n\n### Should I reset the tankless heater?\n\nTake a photo first, then follow only the reset procedure documented for that model. If the same code returns, keep the code and book the diagnosis.\n\n[Link to this answer](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/#answer-should-i-reset-the-tankless-heater>)\n\n### What if my code is not in the library?\n\nSend the brand, full model and exact code with a label photo. Those details let us check the manufacturer’s manual directly.\n\n[Link to this answer](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/#answer-what-if-my-code-is-not-in-the-library>)\n\nRelated water-heater guides\n\n## Use the code with what the heater was doing.\n\n- [**No hot water** Start with the kind of heater you own, then narrow down why the water is cold.](<https://mtnmanplumbing.com/water-heater-no-hot-water/?agentnet=md>)\n\n- [**Age and serial number** Find the manufacturer label and use the brand-specific serial number to work out the age.](<https://mtnmanplumbing.com/water-heater-age-serial-number/?agentnet=md>)\n\n [Back to the complete water-heater guide →](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n\nThe code keeps coming back?\n\n## Keep the code attached to the service request.\n\nAdd the display and factory label. The plumber will have the model and manufacturer definition before the visit.\n\n### Exclusive Offers\n\n  ● Active Specials\n\nMountain Man Plumbing deals and offers\n\nFrom our local guides\n\n## Older homes. New plumbing projects.\n\nOur county-record analysis shows when the neighborhoods were built. 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