Lochinvar water heaters are known for reliability, but like any gas-fired appliance, the pilot light can go out or malfunction. This guide provides clear, step-by-step instructions to safely relight a Lochinvar pilot light, identify common issues, and maintain the unit for optimal performance. It covers understanding pilot light operation, safety precautions, troubleshooting symptoms, and when professional service is advisable. By following these practices, homeowners can extend the life of their Lochinvar water heater and ensure a steady supply of hot water.

Understanding Lochinvar Water Heaters And The Pilot Light

Lochinvar manufactures a range of gas water heaters, including models with standing pilot lights and electronic ignitions. The pilot light provides a small, continuous flame that lights the main burner when hot water is needed. A faulty pilot can prevent the unit from heating, waste energy, or create unsafe conditions. Knowledge of the thermostat control, gas valve, thermocouple, and ignition mechanism helps homeowners diagnose basic issues before contacting a service technician.

Key components involved with the pilot system include the pilot assembly, thermocouple or flame sensor, gas control valve, and the burner. In many Lochinvar models, gas is supplied through a dedicated shutoff valve, and the thermostat signals the gas control to open when hot water is required. If the pilot flame is weak or won’t stay lit, it may indicate a clogged or dirty orifice, a misaligned thermocouple, or a failing gas valve. Regular inspection improves reliability and safety.

Safety First: Precautions Before Relighting

Relighting a Lochinvar water heater requires strict adherence to safety procedures. Always ensure the area is well ventilated and the gas supply is shut off if you smell gas or hear hissing. Keep flames away from flammable materials, and use the correct procedure specified in the user manual. If there is any doubt about the gas supply, or if you smell gas strongly, contact your gas utility or a licensed technician immediately. Never bypass safety controls or attempt DIY repairs beyond basic relighting.

Before proceeding, gather the necessary tools: a long-reach lighter or matches (for older models), a flashlight, and a clean rag to wipe any soot or debris. Turn off power to the water heater if it has an electronic ignition to avoid any electrical hazards. Once you begin the relighting process, follow the steps in a calm, deliberate manner to avoid accidental burns or gas exposure.

How To Relight The Pilot Light On A Lochinvar Water Heater

Relighting methods vary slightly by model, but the general procedure is similar. Always consult the specific model’s manual for exact instructions. Below is a common step-by-step approach for Lochinvar gas water heaters with a standing pilot light:

Turn the gas control knob to the “Off” position and wait for at least five minutes to clear any accumulated gas.
Locate the access panel on the front of the unit, remove it, and locate the pilot assembly. If applicable, position the thermostat control to the “Pilot” or “Off” setting as directed by the manual.
Turn the gas control knob to the “Pilot” position. Press and hold the reset or ignition button if your model requires it, then use a long lighter to ignite the pilot flame at the pilot orifice.
Hold the control knob in the “Pilot” position for 30 to 60 seconds after the flame ignites to ensure the thermocouple is heated. If the flame remains lit, continue to hold briefly before releasing the control to the “On” position.
Observe the main burner ignition once the thermostat calls for heat. If the main burner does not ignite, turn the knob back to “Off,” wait a few minutes, and repeat the process. If lighting fails after repeated attempts, shut off the gas and seek professional help.

For units with electronic ignition, the relighting procedure may involve a spark igniter rather than a standing flame. In those cases, ensure the gas supply is open, and follow the ignition sequence as described in the manual. If the system fails to ignite, the problem may lie with the igniter, flame sensor, or gas valve, which require professional service.

Common Issues After Relighting

Even after a successful relight, several issues can arise that affect performance. Some common symptoms include a pilot that goes out shortly after ignition, a weak or flickering flame, or no flame at all. A pilot that repeatedly goes out is often caused by a dirty pilot orifice, a misaligned flame sensor, or a draft near the vent. A weak flame may indicate clogged gas lines, low gas pressure, or insufficient clearance around the burner.

Inspect for signs of soot around the pilot and burner, which indicates incomplete combustion. Soot buildup suggests a dirty orifice or improper air mixture. Corrosion around the gas valve or thermocouple can also compromise reliability. In any case, repeated failures point to the need for a professional evaluation to avoid gas leaks or carbon monoxide risks.

Troubleshooting Tips And Quick Checks

Regularly inspect the pilot flame. A healthy flame should be blue with a steady, precise shape. A yellow or orange flame can indicate incomplete combustion and warrants investigation.
Keep the burner and pilot area clean. Dust, lint, and debris can obstruct the flame and sensors. Gently wipe with a dry cloth if necessary.
Inspect the thermocouple for correct positioning. If it is bent away from the flame, the system may shut off the gas supply even when the pilot is lit.
Check the gas supply valve for proper operation. Ensure it is fully open when hot water is needed and closed when the heater is not in use.
Test for gas leaks with a soapy water solution around connections. Bubbles indicate leaks that require immediate attention by a licensed technician.

Maintenance Practices To Extend Lifespan

Routine maintenance improves safety and efficiency. Schedule annual professional inspections to verify gas pressure, venting, and overall condition. Homeowners can perform basic upkeep, such as cleaning the burner area, replacing worn gaskets, and ensuring proper venting to prevent condensation and corrosion. Timely replacement of aging components like the thermocouple, igniter, and the gas control valve helps prevent unexpected outages and maintains energy efficiency.

Use manufacturer-approved parts to guarantee compatibility and safety. Keep the area around the water heater clear of stored items to promote adequate ventilation and reduce the risk of fire hazards. If the unit is older or requires frequent relighting, consider upgrading to a newer Lochinvar model with advanced ignition technology for improved reliability and energy savings.

When To Call A Professional

Relighting a Lochinvar water heater is often straightforward, but certain circumstances require expert attention. If the pilot fails to stay lit after repeated attempts, if you detect a gas smell, or if you notice signs of corrosion, heat damage, or vent obstruction, contact a licensed plumber or gas technician immediately. Do not attempt to disassemble the gas valve or thermocouple beyond basic cleaning, as this can create dangerous conditions. For consistent underperformance or chronic outages, professional diagnostics can diagnose issues such as low gas pressure, venting problems, or faulty safety controls.

Additional Resources And Safety Documentation

Consult the Lochinvar user manual for model-specific instructions, diagrams, and safety precautions. Manufacturer resources often include troubleshooting flowcharts, parts lists, and warranty details. Local codes and energy guidelines should be considered, and professional installation is recommended to ensure compliance with building codes and gas safety standards. For ongoing concerns, contact Lochinvar support or a certified HVAC technician who specializes in Lochinvar products.