Rheem water heater failed ignition lockout often occurs due to issues with the gas supply or ignition system. Addressing this problem quickly is crucial for restoring hot water.
Experiencing a failed ignition lockout with your Rheem water heater can be frustrating. This common issue can leave you without hot water and disrupt your daily routine. The problem usually stems from a malfunction in the gas supply or ignition system, which prevents the heater from starting.
Regular maintenance and timely troubleshooting can help prevent these issues. Understanding the causes and solutions will ensure your water heater operates efficiently. Keep an eye on error codes and consult the manual or a professional to resolve the problem quickly. This approach will keep your Rheem water heater running smoothly.

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Page Contents
Common Causes
Gas supply issues can stop the water heater from working. A blocked gas line might be the problem. Sometimes, the gas valve may not open properly. If the gas pressure is too low, the heater won’t ignite.
The ignition system is very important. If the pilot light does not stay lit, the heater fails. A faulty igniter can also cause problems. Wiring issues in the ignition system may stop it from working.
Initial Checks
Check gas supply and electrical connections first for Rheem water heater ignition lockout issues. Inspect pilot light and flame sensor for proper function.
Verify Power Supply
Check if the power supply to the water heater is on. Ensure the circuit breaker is not tripped. Verify the power cord is properly plugged in. Look for any loose wires or connections. A multimeter can help check for voltage.
Inspect Gas Lines
Ensure the gas valve is open and gas is flowing. Inspect the gas lines for any leaks or damage. Use a soapy water solution to detect leaks. Check if the gas pressure is adequate. The gas control valve should be functional.
Resetting The System
Find the reset button on your Rheem water heater. It is usually near the control panel. The button might be red. Use a flashlight if the button is hard to see.
Press and hold the reset button for 10 seconds. Release the button after holding it. Wait for a few minutes. The heater will reset itself. Check if the heater is working now. If not, repeat the steps.
Thermocouple Problems
Rheem water heater ignition lockout often stems from thermocouple problems. Faulty thermocouples can prevent the pilot light from staying lit, causing ignition failures. Regular maintenance can help identify and resolve these issues swiftly.
Signs Of A Faulty Thermocouple
A faulty thermocouple can cause many issues. The water heater might not stay lit. You may notice a weak pilot light. This light might flicker often. Sometimes, the water heater will shut off. This happens even if the water is not hot. The pilot light might go out completely. A bad thermocouple can also cause a lockout. This is to prevent gas leaks.
Replacement Guide
First, turn off the gas supply. Remove the access panel. Locate the thermocouple near the pilot light. Unscrew the thermocouple from the gas valve. Detach it from the burner assembly. Take the new thermocouple and attach it. Screw it back into the gas valve. Make sure it is secure. Turn on the gas supply. Light the pilot and check for proper function.
Pilot Light Issues
The pilot light can go out for many reasons. First, check if the pilot light is lit. If it is out, look for any gas leaks. Make sure there is no smell of gas. If you smell gas, do not light the pilot. Call a professional for help. If there is no gas smell, proceed to relight the pilot. Ensure the area is well-ventilated. Safety is always the first step.
To relight the pilot, turn the gas valve to the off position. Wait for 5 minutes to clear out any gas. Turn the gas valve to the pilot position. Hold down the reset button. While holding it, light the pilot with a long lighter. Keep holding the reset button for 1 minute. Release the button and check if the pilot stays lit. If it goes out, repeat the steps. If it does not stay lit, call a professional.
Control Board Errors
Experiencing a Rheem water heater failed ignition lockout? Faulty control board errors often trigger this issue, affecting heater performance. Immediate troubleshooting can help restore proper function.
Error Codes Explained
Some Rheem water heaters show error codes. These codes help diagnose problems. Error code 11 means ignition failure. Error code 12 shows flame failure. Error code 13 indicates overheating. Error code 14 points to a sensor issue. Error code 15 signals a gas supply problem. Error code 16 shows a blower problem. Error code 17 means a vent blockage. Error code 18 indicates a control board error. Error code 19 points to a power problem.
Possible Solutions
Check the gas supply first. Ensure the gas valve is open. Inspect the igniter for damage. Clean or replace it if needed. Check the flame sensor next. Clean it with fine sandpaper. Verify the venting system is clear. Remove any blockages. Check the blower motor. Ensure it runs smoothly. Inspect the control board for damage. Replace it if needed. Lastly, check the power supply. Ensure the unit is plugged in.
Maintenance Tips
Clean your water heater every few months. Remove dust and dirt around the heater. This helps it run better. Use a soft cloth to clean the outside. Do not use harsh chemicals. Check the air filter if it has one. Clean or replace it if it’s dirty. A clean filter helps the heater work well.
Inspect your water heater once a year. Look for signs of wear and tear. Check the pipes for leaks. Make sure the valves are working. Test the thermostat to see if it’s accurate. Hire a professional for a detailed check. They can fix small issues before they become big problems.

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When To Call A Professional
Some problems need expert help. Water leaks around the heater can be serious. Strange noises like banging or hissing are not normal. Frequent ignition lockouts signal a bigger problem. Burning smells can be dangerous. No hot water at all means trouble. Error codes on the display need a technician.
Pick a technician with good reviews. Ask friends for recommendations. Check for certifications and licenses. Look for experience with Rheem water heaters. Compare prices and services. Ask questions before hiring. Choose a technician who explains the problem. Make sure they offer warranties on their work.

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Frequently Asked Questions
What Does Failed Ignition Lockout Mean?
A failed ignition lockout means your furnace’s safety system prevented it from igniting due to a detected issue. This can be caused by problems like a faulty ignition sensor, gas supply issues, or blocked vents. Regular maintenance can help prevent ignition lockouts.
How Do You Get A Water Heater Out Of Lockout?
Reset the water heater by turning it off and on. Check the manual for specific reset instructions. Ensure gas or power supply is stable. If the issue persists, consult a professional technician. Regular maintenance helps avoid lockouts.
How Do I Reset My Rheem Water Heater?
To reset your Rheem water heater, turn off the power. Locate the reset button on the control panel. Press and hold it until it clicks. Restore power.
Why Does The Ignition Fail On My Tankless Water Heater?
The ignition failure in your tankless water heater can be due to a dirty burner, faulty igniter, or inadequate gas supply. Regular maintenance and professional inspection can prevent these issues. Check for error codes on the display for specific problems.
Conclusion
A Rheem water heater ignition lockout can be frustrating but is often fixable. Regular maintenance is key to preventing issues. Always consult the user manual or a professional for complex problems. With proper care, your Rheem water heater can provide years of reliable service.
Stay proactive to ensure consistent hot water supply.