As an experienced water heater specialist, I understand the importance of maintaining the safety and efficiency of your home’s tankless water heater. In our 10 years of water heater experience… Tankless water heaters offer numerous benefits, such as endless hot water supply and improved energy efficiency, but they also require proper installation, maintenance, and troubleshooting to double-check that optimal performance. In this comprehensive guide, we’ll dive into the details of tankless water heater operation, with a focus on diagnosing and resolving issues related to the pilot light.

Now, this might seem counterintuitive when dealing with water heaters…

Understanding Tankless Water Heater Operation

Tankless water heaters, also known as on-demand water heaters, are designed to heat water instantly as it is needed, without the need for a storage tank. This is achieved through a sophisticated system of components, including a heat exchanger, temperature sensors, and a gas control valve.

When a hot water tap is turned on, the water heater’s sensors detect the flow of water and activate the gas burner. The burner heats a heat exchanger, which in turn heats the incoming water to the desired temperature. This process continues as long as the hot water tap is open, providing a steady supply of hot water on demand.

One of the key components in a tankless water heater is the gas control valve. This valve is responsible for regulating the flow of gas to the burner, ensuring the proper combustion and temperature regulation. The gas control valve works in conjunction with the pilot light, which provides the initial ignition source for the burner.

Troubleshooting Tankless Water Heater Pilot Light Issues

The pilot light is a crucial component of a tankless water heater, as it is responsible for igniting the main burner when hot water is needed. If the pilot light goes out or fails to stay lit, it can prevent the water heater from functioning properly. Here are some common pilot light issues and how to troubleshoot them:

Pilot Light Won’t Light

If the pilot light won’t light, the first step is to check the gas supply. double-check that that the gas shut-off valve is in the open position and that there are no obstructions or kinks in the gas line. If the gas supply is flowing, the issue may be with the pilot light assembly itself.

1. ​Locate the pilot light assembly, which is typically near the bottom of the tankless water heater. Turn the gas control valve to the “OFF” position and wait a few minutes for any accumulated gas to dissipate.
2. Use a small, long-necked lighter or a match to carefully relight the pilot light, following the manufacturer’s instructions. If the pilot light still won’t stay lit, the thermocouple may need to be replaced.

Pilot Light Goes Out

If the pilot light keeps going out, the issue may be with the thermocouple. The thermocouple is a safety device that senses the presence of the pilot light and sends a signal to the gas control valve to keep the gas flowing. If the thermocouple is faulty or not positioned correctly, it may not generate enough voltage to keep the gas valve open, causing the pilot light to go out.

1. Turn the gas control valve to the “OFF” position and wait for the pilot light to extinguish.
2. Use a multimeter to test the thermocouple. Disconnect the thermocouple from the gas control valve, and with the pilot light lit, measure the voltage output. The voltage should be around 25-30 millivolts. If the reading is significantly lower or zero, the thermocouple needs to be replaced.
3. Carefully remove the old thermocouple and install a new one, following the manufacturer’s instructions. Be sure to position the new thermocouple correctly, as its placement is crucial for proper operation.

Pilot Light Adjustment

In some cases, the pilot light may be burning too high or too low, affecting the water heater’s efficiency and safety. The pilot light flame should be a clean, blue color and approximately 1 to 1.5 inches in height.

1. Locate the pilot light adjustment screw, usually on the gas control valve.
2. With a small flathead screwdriver, turn the adjustment screw clockwise to decrease the flame size or counterclockwise to increase the flame size.
3. Adjust the flame until it is a clean, blue color and the desired height. Avoid setting the flame too high, as this can be a fire hazard.

By addressing these common pilot light issues, you can help double-check that the safe and reliable operation of your tankless water heater. Remember to always follow the manufacturer’s instructions and exercise caution when working with gas-powered appliances.

Safety Considerations for Tankless Water Heater Maintenance

While many tankless water heater issues can be addressed through DIY troubleshooting, it’s essential to prioritize safety when working with gas-powered appliances. Here are some important safety precautions to keep in mind:

Gas Leak Detection

Regularly inspect your tankless water heater and associated gas lines for any signs of gas leaks, such as the smell of rotten eggs or hissing sounds. If you suspect a gas leak, immediately shut off the gas supply and contact a professional plumber or HVAC technician for assistance. Never attempt to repair a gas leak on your own, as it can be extremely hazardous.

Proper Ventilation

Tankless water heaters require adequate ventilation to prevent the buildup of harmful gases, such as carbon monoxide. double-check that that the water heater is installed in a well-ventilated area and that the venting system is functioning correctly. If you notice any signs of poor ventilation, such as headaches or dizziness, stop using the water heater and seek professional help immediately.

Electrical Safety

For tankless water heaters that require an electrical connection, it’s crucial to follow proper safety protocols. Disconnect the power supply before performing any maintenance or repairs, and double-check that that all electrical connections are secure and grounded. If you’re not comfortable working with electrical components, it’s best to consult a licensed electrician.

Professional Maintenance and Repair Services

While DIY troubleshooting can be effective for minor issues, some tankless water heater problems may require the expertise of a professional plumber or HVAC technician. Engaging professional maintenance and repair services offers several benefits:

1. Expertise and Experience: Trained professionals have the knowledge and skills to diagnose and address complex tankless water heater issues, ensuring a safe and effective resolution.
2. Comprehensive Inspections: Regular maintenance by a professional can help identify potential problems before they become more severe, allowing for proactive repairs and improved system longevity.
3. Manufacturer Compliance: Professional technicians are familiar with the specific requirements and guidelines set by tankless water heater manufacturers, ensuring that any repairs or maintenance are performed in accordance with the manufacturer’s recommendations.
4. Safety and Liability: Hiring a licensed and insured professional reduces the risk of accidents or further damage to your home or water heater, and provides liability coverage if any issues arise during the repair process.

At waterheaterpick.com, we understand the importance of maintaining the safety and reliability of your tankless water heater. Our team of experienced specialists is dedicated to providing comprehensive maintenance and repair services to homeowners in your area. Whether you’re experiencing pilot light issues, gas control valve problems, or any other tankless water heater concerns, we’re here to help.

Don’t let pilot light troubles or other tankless water heater problems disrupt your hot water supply or compromise your home’s safety. Contact waterheaterpick.com today to schedule professional maintenance or repair services and double-check that your tankless water heater continues to operate safely and efficiently for years to come.

Tip: Flush your water heater tank at least once per year