Lochinvar Knight Boiler Fault Codes: Troubleshooting Tips

The Lochinvar Knight boiler can display fault codes that indicate certain issues. For example, the “blocked” code can indicate excessive condensate buildup in the unit’s drain system.

Troubleshooting steps include checking the condensate tube for obstructions and ensuring the condensate trap is not blocked. Additionally, if the boiler displays a “flow switch/LWCO” error code, it may be necessary to reset the boiler. Detailed instructions can be found in the Lochinvar Knight XL Boiler maintenance reminder reset video.

It’s important to follow the provided manual and perform the necessary steps to resolve any fault code issues with the Lochinvar Knight boiler and ensure its proper functioning.

Lochinvar Knight Boiler Fault Codes

Common Fault Codes

If you own a Lochinvar Knight Boiler, it’s essential to understand the common fault codes that may appear. These fault codes can help you troubleshoot and resolve any issues with your boiler efficiently. In this section, we will discuss three common fault codes: Flow Switch/LWCO Error, Inlet Sensor Fault, and Blocked Drain Error.

Flow Switch/lwco Error

The Flow Switch/LWCO (Low Water Cut Off) Error is one of the most common fault codes encountered by users. This error occurs when the boiler’s flow switch does not detect water flow or when the low water cut-off sensor indicates a low water level. When this fault code appears, it is crucial to check the flow switch and ensure that the water level is adequate for the boiler’s operation.

Inlet Sensor Fault

The Inlet Sensor Fault is another fault code that you may come across. This fault code indicates an issue with the inlet sensor, which is responsible for monitoring the temperature of the incoming water. If the inlet sensor is not functioning correctly, it can lead to inaccurate temperature readings and affect the boiler’s performance. When this fault code appears, it is recommended to inspect the inlet sensor and ensure it is properly connected and functioning.

Blocked Drain Error

The Blocked Drain Error is a fault code that signals a problem with the condensate drainage system of the boiler. This code appears when the drain switch detects excessive condensate build-up inside the unit. To resolve this issue, it is essential to check the condensate tube for proper installation and obstructions. Inspecting the condensate trap for any blockages is also recommended. By clearing any blockages in the drainage system, you can prevent further issues with the boiler’s performance.

Understanding these common fault codes for the Lochinvar Knight Boiler can help you diagnose and resolve any issues quickly. If you encounter any of these fault codes, perform the recommended checks and inspections to ensure the smooth operation of your boiler.

Troubleshooting Tips

Troubleshoot Lochinvar Knight boiler fault codes by checking gas valve, voltage, and pressure. Reset maintenance reminders easily with online guides and professional services. Ensure proper installation and maintenance to avoid issues like blocked drains and carbon monoxide risks.

Resetting The Boiler

When experiencing issues with your Lochinvar Knight boiler, a common first step is to reset the system. To reset the boiler, locate the reset button on the control panel and press it. Allow the boiler to restart and observe if the fault code persists.

Checking the gas And Pressure

If the reset does not resolve the issue, check the gas valve and pressure. Ensure that the gas valve is open and functioning correctly. Check the gas pressure to make sure it meets the required specifications for the Lochinvar Knight boiler model.

Inspecting For Leaks

Leaks can be a common cause of boiler malfunctions. Inspect all visible components of the boiler system for leaks, including pipes, connections, and fittings. Address any leaks promptly to prevent further damage to the unit.

Maintenance And Safety Measures

Proper maintenance and safety measures are crucial for ensuring the efficient and safe operation of your Lochinvar Knight boiler. Regular maintenance not only helps prevent unexpected breakdowns but also extends the lifespan of your boiler.

Tips For Regular Maintenance

  • Schedule annual professional maintenance checks.
  • Clean the condensate drain and trap regularly.
  • Check for leaks or corrosion in the boiler components.
  • Inspect and clean the burner assembly for optimal performance.
  • Monitor the flue collector for any signs of damage.

Safety Precautions

  1. Never attempt to repair the boiler yourself if you are not trained.
  2. Install carbon monoxide detectors near the boiler area.
  3. Keep the boiler room well-ventilated at all times.
  4. Ensure all safety controls are operational.

By following these maintenance tips and safety precautions, you can ensure that your Lochinvar Knight boiler operates efficiently and safely for years to come.

Recalls And Safety Concerns

Lochinvar Knight boilers may experience fault codes, such as “blocked” or “flow switch/LWCO” errors, indicating potential safety concerns. These faults can lead to issues like excessive condensate build-up or carbon monoxide emissions, posing risks to users. It is important to follow troubleshooting guidelines and consult the service manual for proper maintenance and safety measures.

Risk Of Carbon Monoxide Poisoning

Carbon monoxide is a colorless, odorless gas that can be extremely dangerous if not detected. It is produced when fuel is burned incompletely, such as in malfunctioning boilers. The Lochinvar Knight boiler has been recalled due to the risk of carbon monoxide poisoning. The boiler’s flue collector can crack if exposed to a high-impact event in the burner chamber, allowing carbon monoxide to be emitted. This poses a serious health risk to anyone in the vicinity of the boiler.

Recall Information

Lochinvar has issued a recall for their condensing boilers, including the Knight model, due to the risk of carbon monoxide poisoning. The recall was initiated because the boiler’s flue collector can crack if exposed to a high-impact event in the burner chamber. This crack can lead to the emission of carbon monoxide, which can be deadly. It is important to check if your boiler is affected by this recall to ensure the safety of your household.

If you own a Lochinvar Knight boiler, it is crucial to take immediate action to address this safety concern. Contact Lochinvar or the relevant authorities to find out if your boiler is included in the recall. Follow the instructions provided to schedule an inspection and any necessary repairs or replacements. In the meantime, it is recommended to ensure proper ventilation and install carbon monoxide detectors in your home to detect any potential leaks.

To check if your boiler is affected by the recall, you can refer to the Lochinvar website or call their customer service hotline. Provide them with the model number and serial number of your boiler for accurate information. Remember, the safety of your family and loved ones should be your utmost priority, and addressing this recall is essential in preventing any potential harm.

In conclusion, the Lochinvar Knight boiler has been recalled due to the risk of carbon monoxide poisoning. It is crucial to check if your boiler is affected by this recall and take the necessary steps to ensure the safety of your household. Carbon monoxide is a silent and deadly gas, and it is important to address any potential leaks to prevent any tragic incidents.

Diy Solutions

DIY Solutions for Lochinvar Knight Boiler Fault Codes

Diy Troubleshooting

When your Lochinvar Knight boiler displays a fault code, a DIY troubleshooting approach can often resolve the issue. Start by checking the error code in the provided manual to understand the specific problem. Ensure all connections are secure and the wiring is intact. Look for any visible signs of damage or blockages in the system.

Cleaning The Condensate Drain And Trap

One common issue leading to fault codes in Lochinvar Knight boilers is a blocked condensate drain and trap. If the drain and trap are not properly draining, it can trigger error codes. Refer to the manufacturer’s manual for locating the condensate drain and trap. Regularly clean and ensure proper drainage to prevent blockages and subsequent fault codes.

Professional Assistance

Experiencing fault codes on your Lochinvar Knight boiler can be frustrating. It’s essential to seek professional assistance to ensure the proper functioning of your boiler. Whether you need to contact customer support or seek professional help, knowing the right steps to take can save you time and money in the long run.

Contacting Customer Support

When dealing with fault codes, reaching out to Lochinvar’s customer support can provide valuable insights. Their knowledgeable team can guide you through troubleshooting steps, identify the fault codes, and offer solutions to resolve any issues with your boiler.

Seeking Professional Help

If the fault codes persist or if you’re unsure about the next steps, it’s best to seek assistance from a certified technician. A professional will have the expertise to diagnose and address any underlying problems with your Lochinvar Knight boiler, ensuring it operates efficiently and safely.

Frequently Asked Questions

How Do I Reset My Lochinvar Knight Boiler?

To reset your Lochinvar Knight boiler, locate the reset button on the control panel. Press it and hold for 5 seconds. The boiler will reset and restart.

What Is The Code For Lochinvar Boiler?

The code for the Lochinvar boiler may vary depending on the specific issue. Common codes include “Blocked” signalizing a blocked drain switch or “Flow Switch/LWCO” representing a flow switch or low water cut-off problem. If you encounter an error code, refer to the service manual for troubleshooting.

What Is the Problem With the Lochinvar Boiler?

The problem with the Lochinvar boiler is the risk of carbon monoxide poisoning due to the potential cracking of the flue collector during a high-impact event in the burner chamber.

What Does Block Mean On A Lochinvar Boiler?

The “blocked” code on a Lochinvar boiler means that the blocked drain switch has detected excessive condensate buildup. Check the condensate tube and trap for obstructions.

What Is the Most Common Lochinvar Boiler Fault Code?

Lochinvar boilers frequently display the error code “Blocked Drain,” indicating condensation issues. Check for proper drainage and obstructions.


To troubleshoot any issues with your Lochinvar Knight Boiler, it is important to understand the fault codes and their meanings. By properly identifying the error, you can safely address the problem and prevent further issues. Remember to check for any blocked drains or excessive condensate build-up, as this can lead to error codes and malfunctions.

Always refer to the manufacturer’s manual for specific instructions and follow proper installation procedures. With the right knowledge and maintenance, you can ensure optimal performance from your Lochinvar Knight Boiler.

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