"If you have a gas water heater that isn't working, your pilot light might be the problem. Most pilot lights are located at the bottom of the water heater, underneath the tank. It could be behind an access panel or glass screen. Check the manual for your water heater or follow these instructions to relight the pilot light. If you light the pilot but it goes out immediately, make sure you hold in the gas control knob for 20 to 30 seconds."
"It keeps the pilot light aflame by producing an appropriate voltage in between the two junctions based on the temperature of the water. Before attempting to fix this part, you must find out if your water heater has a traditional thermocouple or a flame sensor. Some newer gas water heaters use a flame sensor. These electronic-ignition systems work similarly to thermocouples, but they sense that the burners are lit by detecting gas."
Average water heaters last 6 to 13 years and require regular upkeep. Heating water accounts for about 18% of household energy use, so efficient operation matters. Lack of hot water can indicate the heater is not turning on and requires investigation of the unit's power or fuel source. Repair approach depends on the heater type. Gas units use gas-fired burners at the tank bottom. A common gas issue is an extinguished pilot light, typically located beneath the tank behind an access panel or glass screen. Relight the pilot and hold the gas control knob for 20–30 seconds to help stabilize ignition. If the pilot will not stay lit, inspect or replace the thermocouple or flame sensor. Some newer gas heaters use electronic flame sensors that detect gas and trigger ignition similarly to thermocouples.
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