Price Match GuaranteeWater Heater Repair FAQs: Troubleshooting, Parts & Fixes
Start by matching the symptom to the problem: not heating, leaking, not lighting, water too hot, hot water smells bad, running out of hot water, or making noise. Check simple causes first, including power, gas supply, pilot condition, temperature setting, reset button, drain valve, and visible leaks. Use the water heater repair help page to choose the closest troubleshooting path.
Use the model number from your water heater label to filter parts that fit your exact unit. Gas and electric water heaters use different components, and even similar models can use different thermostats, heating elements, valves, pilots, sensors, and igniters. Start with water heater replacement parts to narrow by model, symptom, or part category.
A water heater that is not heating may have a failed thermocouple, incoming power problem, tripped limit switch, faulty thermostat, restricted pilot, bad gas valve and thermostat assembly, tripped reset button, or failed heating element. Gas models should be checked for pilot and gas valve issues, while electric models should be checked for power, thermostats, reset buttons, and elements. Use water heater not heating troubleshooting to compare the most common causes.
Yes. The thermocouple detects the pilot flame, and if it does not sense the flame correctly, it can prevent the gas valve from opening. If the pilot lights but will not stay lit, or the burner will not fire, the thermocouple may need testing or replacement. Match the correct part through water heater thermocouple parts.
Yes. The pilot ignites the gas burner, and a restricted or dirty pilot can keep the burner from lighting. Carbon buildup can sometimes be cleared with a stiff brush or compressed air, but a damaged or restricted pilot may need replacement. Use water heater pilot parts if the pilot assembly needs to be replaced. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
A leaking water heater may have a bad temperature and pressure relief valve, leaking drain valve, loose plumbing connection, or corroded tank. Identify whether the leak is coming from a valve, pipe connection, or the tank itself before ordering parts. Use water heater leaking troubleshooting to narrow the source.
Yes. The Temperature and Pressure Relief Valve can discharge water if the valve is defective, but it can also open because temperature or pressure is too high. Do not assume the valve itself is the only problem. Have abnormal pressure or temperature conditions corrected before replacing the valve. If the valve is confirmed defective, match the correct replacement through water heater temperature and pressure relief valve parts.
Yes. The drain valve is used to drain the water heater for maintenance or to flush mineral deposits from the tank. If the drain valve itself is leaking, drain the tank safely and replace the valve. Use water heater drain valve parts to find the correct replacement. Shut off the heat source and water supply, allow the water to cool, and relieve pressure before draining the tank or removing the valve.
Water leaking from the bottom of the tank often points to corrosion that cannot be repaired. If the tank is rusted or the leak is coming from the tank body instead of a valve or plumbing connection, the water heater usually needs replacement. Shut off the water supply and power or gas if the leak is active or spreading.
A water heater that will not light may have a tripped limit switch or thermostat, bad gas valve and thermostat assembly, flammable vapor issue, failed temperature sensor, or defective igniter. Make sure flammable vapors from paint, stains, fuel, or solvents are not stored near the water heater. Use water heater not lighting troubleshooting to work through the likely causes.
Yes. The gas valve opens to allow gas to enter the burner, and if it does not open, the burner will not light. Confirm the ignition sequence and gas supply according to the model service information. Gas-pressure testing and gas valve diagnosis should be handled by a qualified technician. If testing points to the valve, compare water heater gas valve and thermostat assembly parts. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
Yes. Some water heaters use an igniter to light the gas, and if the igniter fails, the burner will not light. Inspect the igniter for visible damage and follow the model-specific test procedure. Energized electrical testing around a gas appliance should be handled by someone trained to perform it safely. If testing confirms failure, replace it with the correct water heater igniter part. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
Water that is too hot may be caused by a defective thermostat, failed gas valve and thermostat assembly, malfunctioning gas valve assembly, or shorted heating element. Check the water temperature at the nearest faucet and compare it with the selected thermostat setting. Use water heater too hot troubleshooting before replacing temperature-control parts.
Yes. If an electric water heater heating element is shorted to ground, it can heat continuously and cause the water to get too hot. Test the element with a multimeter and replace it if it is shorted. Match the correct replacement through water heater heating element parts.
Yes. The thermostat controls the maximum water temperature setting, so a defective thermostat can cause water to be too hot, too cool, or inconsistent. Test the thermostat according to the wiring diagram and replace it if the readings do not match the expected operation. Compare model-specific water heater thermostat parts before ordering.
Bad-smelling hot water is often related to the anode rod and certain minerals or chemicals in the water supply. In some cases, the anode rod can contribute to hydrogen sulfide gas, which makes the hot water smell like rotten eggs. Use water heater hot water smells bad troubleshooting to confirm the likely source.
The anode rod helps protect the tank from corrosion. Depending on the water supply, the rod can sometimes react with minerals and contribute to rotten egg odor in the hot water. If replacement is needed, match the correct water heater anode rod by model number.
A water heater that runs out of hot water may have a thermostat problem, heating element issue, gas valve and thermostat assembly failure, sediment buildup, undersized tank, or heavy demand. On electric models, one failed element can leave the tank with only partial heating capacity. Use water heater runs out of hot water troubleshooting to compare the common causes.
If an electric water heater only provides a small amount of hot water, the lower heating element may have failed or a thermostat may not be calling for heat correctly. The upper element can heat the top of the tank while the rest of the tank stays cool. Test the elements and thermostats before replacing parts.
Yes. Mineral sediment can collect at the bottom of the tank and cause popping, rumbling, or banging noises as water heats. Flushing the tank may help if the buildup is not too severe. Use water heater making noise troubleshooting to determine whether the noise points to sediment, pressure, or another issue.
Popping or rumbling is commonly linked to sediment buildup in the tank. Turn off the power or gas according to the owner's manual, let the water cool, and flush the tank if the model allows it. If the noise continues or the tank shows signs of rust, leaking, or overheating, replacement or professional service may be needed.
Yes. On many electric water heaters, the reset button trips when the safety limit switch detects overheating. You can press the reset button, but the heating element and thermostat should be checked so the problem does not return. Repeated reset trips usually mean a part is overheating or failing.
Common DIY repairs may include replacing some thermostats, heating elements, thermocouples, pilots, igniters, drain valves, anode rods, and temperature and pressure relief valves when the unit is safely shut off and the repair matches your skill level. Always disconnect power to electric models, shut off gas when required, and let hot water cool before servicing. Use the model number to confirm the exact part before ordering.
Use a licensed technician for active gas leaks, major plumbing leaks, tank replacement, electrical service issues, repeated breaker trips, flammable vapor system problems, pressure problems, and any repair required by local code. Stop using the unit if you smell gas, see water near electrical components, or notice severe corrosion. Water heaters involve gas, electricity, pressure, and very hot water, so safety should drive the repair decision. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
Your water heater model number is usually listed on a rating label or data plate attached to the outside of the tank or cabinet. Use the full model number, not just the brand or serial number, so you can match parts correctly. If you need help locating it, use the water heater model number help page before shopping for parts.
Start by matching the symptom to the problem: not heating, leaking, not lighting, water too hot, hot water smells bad, running out of hot water, or making noise. Check simple causes first, including power, gas supply, pilot condition, temperature setting, reset button, drain valve, and visible leaks. Use the water heater repair help page to choose the closest troubleshooting path.
Use the model number from your water heater label to filter parts that fit your exact unit. Gas and electric water heaters use different components, and even similar models can use different thermostats, heating elements, valves, pilots, sensors, and igniters. Start with water heater replacement parts to narrow by model, symptom, or part category.
A water heater that is not heating may have a failed thermocouple, incoming power problem, tripped limit switch, faulty thermostat, restricted pilot, bad gas valve and thermostat assembly, tripped reset button, or failed heating element. Gas models should be checked for pilot and gas valve issues, while electric models should be checked for power, thermostats, reset buttons, and elements. Use water heater not heating troubleshooting to compare the most common causes.
Yes. The thermocouple detects the pilot flame, and if it does not sense the flame correctly, it can prevent the gas valve from opening. If the pilot lights but will not stay lit, or the burner will not fire, the thermocouple may need testing or replacement. Match the correct part through water heater thermocouple parts.
Yes. The pilot ignites the gas burner, and a restricted or dirty pilot can keep the burner from lighting. Carbon buildup can sometimes be cleared with a stiff brush or compressed air, but a damaged or restricted pilot may need replacement. Use water heater pilot parts if the pilot assembly needs to be replaced. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
A leaking water heater may have a bad temperature and pressure relief valve, leaking drain valve, loose plumbing connection, or corroded tank. Identify whether the leak is coming from a valve, pipe connection, or the tank itself before ordering parts. Use water heater leaking troubleshooting to narrow the source.
Yes. The Temperature and Pressure Relief Valve can discharge water if the valve is defective, but it can also open because temperature or pressure is too high. Do not assume the valve itself is the only problem. Have abnormal pressure or temperature conditions corrected before replacing the valve. If the valve is confirmed defective, match the correct replacement through water heater temperature and pressure relief valve parts.
Yes. The drain valve is used to drain the water heater for maintenance or to flush mineral deposits from the tank. If the drain valve itself is leaking, drain the tank safely and replace the valve. Use water heater drain valve parts to find the correct replacement. Shut off the heat source and water supply, allow the water to cool, and relieve pressure before draining the tank or removing the valve.
Water leaking from the bottom of the tank often points to corrosion that cannot be repaired. If the tank is rusted or the leak is coming from the tank body instead of a valve or plumbing connection, the water heater usually needs replacement. Shut off the water supply and power or gas if the leak is active or spreading.
A water heater that will not light may have a tripped limit switch or thermostat, bad gas valve and thermostat assembly, flammable vapor issue, failed temperature sensor, or defective igniter. Make sure flammable vapors from paint, stains, fuel, or solvents are not stored near the water heater. Use water heater not lighting troubleshooting to work through the likely causes.
Yes. The gas valve opens to allow gas to enter the burner, and if it does not open, the burner will not light. Confirm the ignition sequence and gas supply according to the model service information. Gas-pressure testing and gas valve diagnosis should be handled by a qualified technician. If testing points to the valve, compare water heater gas valve and thermostat assembly parts. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
Yes. Some water heaters use an igniter to light the gas, and if the igniter fails, the burner will not light. Inspect the igniter for visible damage and follow the model-specific test procedure. Energized electrical testing around a gas appliance should be handled by someone trained to perform it safely. If testing confirms failure, replace it with the correct water heater igniter part. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
Water that is too hot may be caused by a defective thermostat, failed gas valve and thermostat assembly, malfunctioning gas valve assembly, or shorted heating element. Check the water temperature at the nearest faucet and compare it with the selected thermostat setting. Use water heater too hot troubleshooting before replacing temperature-control parts.
Yes. If an electric water heater heating element is shorted to ground, it can heat continuously and cause the water to get too hot. Test the element with a multimeter and replace it if it is shorted. Match the correct replacement through water heater heating element parts.
Yes. The thermostat controls the maximum water temperature setting, so a defective thermostat can cause water to be too hot, too cool, or inconsistent. Test the thermostat according to the wiring diagram and replace it if the readings do not match the expected operation. Compare model-specific water heater thermostat parts before ordering.
Bad-smelling hot water is often related to the anode rod and certain minerals or chemicals in the water supply. In some cases, the anode rod can contribute to hydrogen sulfide gas, which makes the hot water smell like rotten eggs. Use water heater hot water smells bad troubleshooting to confirm the likely source.
The anode rod helps protect the tank from corrosion. Depending on the water supply, the rod can sometimes react with minerals and contribute to rotten egg odor in the hot water. If replacement is needed, match the correct water heater anode rod by model number.
A water heater that runs out of hot water may have a thermostat problem, heating element issue, gas valve and thermostat assembly failure, sediment buildup, undersized tank, or heavy demand. On electric models, one failed element can leave the tank with only partial heating capacity. Use water heater runs out of hot water troubleshooting to compare the common causes.
If an electric water heater only provides a small amount of hot water, the lower heating element may have failed or a thermostat may not be calling for heat correctly. The upper element can heat the top of the tank while the rest of the tank stays cool. Test the elements and thermostats before replacing parts.
Yes. Mineral sediment can collect at the bottom of the tank and cause popping, rumbling, or banging noises as water heats. Flushing the tank may help if the buildup is not too severe. Use water heater making noise troubleshooting to determine whether the noise points to sediment, pressure, or another issue.
Popping or rumbling is commonly linked to sediment buildup in the tank. Turn off the power or gas according to the owner's manual, let the water cool, and flush the tank if the model allows it. If the noise continues or the tank shows signs of rust, leaking, or overheating, replacement or professional service may be needed.
Yes. On many electric water heaters, the reset button trips when the safety limit switch detects overheating. You can press the reset button, but the heating element and thermostat should be checked so the problem does not return. Repeated reset trips usually mean a part is overheating or failing.
Common DIY repairs may include replacing some thermostats, heating elements, thermocouples, pilots, igniters, drain valves, anode rods, and temperature and pressure relief valves when the unit is safely shut off and the repair matches your skill level. Always disconnect power to electric models, shut off gas when required, and let hot water cool before servicing. Use the model number to confirm the exact part before ordering.
Use a licensed technician for active gas leaks, major plumbing leaks, tank replacement, electrical service issues, repeated breaker trips, flammable vapor system problems, pressure problems, and any repair required by local code. Stop using the unit if you smell gas, see water near electrical components, or notice severe corrosion. Water heaters involve gas, electricity, pressure, and very hot water, so safety should drive the repair decision. If you smell gas, shut off the gas supply at the appliance valve, ventilate the area, avoid sparks or flames, and contact your gas utility. Do not attempt gas-line repairs without the training and tools to do them safely.
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