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Water heater not heating

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Gas Water Heater Not Heating? Gas Water Heater Troubleshooting

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Common solutions for: Water heater not heating

01 - Thermocouple
Some gas water heaters have a thermocouple. The thermocouple detects the pilot flame. If the thermocouple does not detect a flame, it will prevent the gas valve from opening.
Required Part
Water Heater Thermocouple
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Most Common Solution
02 - Gas Valve and Thermostat Assembly
The gas valve opens to allow gas to enter the burner. If the gas valve does not open, the burner will not light, and the water heater will not heat. First, ensure that the ignition source is working properly. Second, ensure that the gas valve has pressure. If the ignition source is working, and the gas valve has pressure, consider replacing the gas valve and thermostat.
Required Part
Water Heater Gas Valve and Thermostat Assembly
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Common Solution
03 - Pilot
The pilot ignites the water heater’s gas burner. If the pilot does not light, the water heater will not heat. Sometimes, carbon deposits can build up on the pilot and eventually create a restriction. If the pilot is restricted, try removing it and clearing it with a stiff brush and/or compressed air. If the pilot cannot be cleaned, replace it.
Required Part
Water Heater Pilot
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Common Solution
04 - Dip Tube
If the water heater does not heat, the dip tube may have broke or cracked. The dip tube delivers cold water toward the bottom of the tank where it can be heated by the burner.
Required Part
Water Heater Dip Tube
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Common Solution
05 - Draft Inducer Motor
The draft inducer fan motor draws air into the burner and then exhausts it out the flue. As the air flows through the draft inducer assembly, it closes a vacuum switch to signal that proper air flow is present. If the inducer motor is not working properly, the water heater will not heat. Over time, the bearings on the inducer motor wear out. The inducer motor could also have a plugged vacuum port. If the vacuum port is plugged, the motor will not be able to close the vacuum switch, causing the i...gnition process to stall.
Required Part
Water Heater Draft Inducer Motor
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Common Solution
06 - Ignition Module
The ignition module cycles the igniter or sparker on to light the burner. If the ignition module is defective, the burner will not light. To determine if the ignition module is defective, check to ensure that power is getting to the ignition module. If power is getting to the ignition module, but the burner will not light, consider replacing the ignition module.
Required Part
Water Heater Ignition Module
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Common Solution

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