The gas valve on a water heater controls the gas flow. If it gets faulty, no gas will flow to the water heater. And without fuel, you can’t ignite the unit to get hot water for showers or other daily activities related to water.
In this guide on the Rheem water heater gas valve problem, we will break down:
- How to tell if the water heater gas valve is bad?
- How to replace the gas valve on a Rheem water heater?
- How to reset the Rheem water heater gas valve?
Without further ado, let’s dive in.
Table of Contents
- How To Tell If Rheem Water Heater Gas Valve Is At Problem?
- Rheem Water Heater Gas Valve Replacement: The How-To Steps
- How To Reset Rheem Water Heater Gas Valve?
How To Tell If Rheem Water Heater Gas Valve Is At Problem?
A bad gas valve on the Rheem water heater prevents the pilot light from coming on. Or, the pilot light won’t stay lit once you release the igniter button if the gas valve is at fault. Besides, it may cause the water to be too hot or trip the thermal cut-off switch if the gas valve goes bad.
Of course, those problems are also the symptoms of a defective thermocouple. So, it’s better to test the thermocouple first before swapping the old gas valve. To test the thermocouple electrically, you should use a multimeter.
Once you get the multimeter, just disconnect the thermopile wire harness from the gas control valve. Then, attach the red lead of the multimeter to the red terminal of the thermopile and the black one to the white terminal.
Now, set the gas control to pilot and hold down the gas control knob. Then, keep depressing the igniter button at the same time. You can check out this video if you don’t know how to test the thermopile:
A functional thermopile should give between 650 to 850 millivolts. If you don’t get the reading, you must replace the thermopile.
If there is no issue with the thermopile and the pilot light goes out, I bet the gas valve is the culprit.
In this case, you must replace it to solve the Rheem water heater gas valve problem. The next chapter will help you change the gas control valve.
Rheem Water Heater Gas Valve Replacement: The How-To Steps
Replacing the gas valve is the only solution to the water heater gas valve problem. It’s because there is no option to repair the gas valve. And this chapter will let you learn how to replace gas control valve on Rheem water heater. It will save you hundreds of bucks.
Before heading over to the replacement workflow, ensure you have the following equipment at your fingertips:
- An adjustable wrench
- A pipe wrench
- A garden hose
- A new gas valve
Step 1. Turn the Gas Supply Off
Begin with turning the gas shut-off valve to the Off position. It will stop the gas from flowing into your water heater. Just turn the valve that is in the gas line so that it will stay perpendicular with the gas supply line just like this:
Step 2. Drain The Water Tank
Attach a garden hose to the bottom of your water heater and place the other end of the hose to the nearest floor drain. Ensure you close the shut-off valve at the cold water inlet line. Now, open the drain valve of your water heater and let the water drain.
Step 3. Disconnect all the lines from the Gas Valve
Use the adjustable wrench to detach all the lines like the thermocouple connector and other supply lines. The gas valve is connected to the gas line through a pipe. You need to disconnect the pipe by unscrewing the nipples on both sides of the tee. Then, detach the gas line from the gas valve. Don’t forget to store the nipples and other pieces as you need them.
Step 4. Replace The Gas Valve
Once you unhook all the lines from the gas valve, it’s time to remove the valve from the unit. Just grab a pipe wrench, adjust its jaws, and set the pipe wrench on the gas valve. Then, rotate the pipe wrench counterclockwise to pull out the gas control valve.
Now, install a new gas control valve. Before installing, use Teflon tape on the threaded part of the pipe leading to the hot water. Use the pipe wrench again to tighten up the gas valve.
How To Reset Rheem Water Heater Gas Valve?
Resetting a gas valve on a Rheem water heater is not rocket science. Just follow the below steps to reset it:
- Turn the valve off and unplug it from the electrical connection for a minute.
- Plug it back again and turn the valve on.
- Now, set the temperature knob to the lowest setting. Now, rotate the knob from the lowest setting to the highest setting. Count 1, 2, 3, 4, 5, 6, and 7 and rotate the knob back and forth at the same time. Once you reach 7, you can see the status light stops flashing, which indicates you reset the gas valve successfully.
Can a gas control valve be fixed?
No, a gas control valve can’t be fixed. It means you need to replace the gas valve once it gets faulty.
Can you change a gas valve on a water heater without draining it?
No, you can’t change a gas valve on a water heater without draining it. Just attach a garden hose to the drain valve which you can find at the bottom of the water heater. Then, place the other end of the hose to the closest floor drain. Now, open the drain valve and drain the water.
How long should a gas valve last?
A gas valve should last up to 15 years.
You must replace the gas valve if the Rheem water heater gas valve is at fault. Fortunately, we broke down the way of changing it. Just follow the steps we mentioned and make the replacement.
If you have any questions about the water heater, leave a comment below. We feel happy to help.
Eric Alvarez is an HVAC guy based in El Paso, Texas, United States. He obtained his Bachelor of Science degree from the University Of Texas at El Paso. Years of experience in the HVAC field have taught him many lessons, not the least of which is that the value of quality and knowledge far exceeds any promised initial savings. He has a good standing reputation for superior skills in heating, air conditioning, hot water tanks, and indoor air quality systems.