Natural gas water heater pop off valve leaking even after replacement

Turn off gas to the heater close water supply drain the water out of heater.Remove pilot tube assembly remove thermocouple/or thermopile assembly disconnect gas at the union and remove from valve. Use wrench that fits the hex shaped nut that holds the aquastat and water heater in the tapping. Usually the wrench size is 3/4" or 7/8" depending on the unit.

Put pipe dope on the male thread of the valve and keep it off the aquastat bulb, and rethread into the tapping.

Replace the ilot assembly being sure it was not damaged when it was remover if it was damaged replace it. replace the thermocouple/powerpile assembly replace the gas piping from the valve being sure to use pipe dope on the fittings and tighten them enough so they do not leak. Do not use teflon tape because it could get into the gas valve and cause problems.Test the gas piping for leaking do a tight test on the meter if possible or test with testing fluid and look for bubbles or use a gas leak detector that sniffs for gas and beeps when it detects a leak

Fill the water heater up with cold water and check to be sure there are no leaks at the thread where the valve is threaded into the tapping. Open a hot water faucet and be sure the heater is full of water.

Light the pilot and turn the gas on set to the temp that is best suited to you..

1) Bad gas control thermostat, or thermostat has come out of calibration, or water leak running hot water out of tank.
Turn up temperature.
Replace gas control valve.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

2) Clean air intake, put ear against pipes and listen for water leak, check that flame is clear blue and that combustion gasses are flowing up the vent pipe and not blocked.

3) Call service technician.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Copy following link for troubleshoot and replacement TP valve:
http://waterheatertimer.org/How-to-replace-TP-valve.html

2) Add comment and say what you find

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following links for step-by-step replacement of water heater gas control valve:
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf
http://waterheatertimer.org/pdf/How-to-replace-gas-control.pdf

Troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The red button sometime hangs up if the dial is not centered up. First check to see if the button is going all the way down. it should touch the gray box that has the temp dial on it.

If the button is going all the way down and you are still not getting gas to the pilot to light the main gas valve needs to be replaced. I dont know what your skill levels are so I am not going to tell you to replace it on your own.

If you do have the skills then replace the main gas valve, which means you have to drain the tank, go to Lowes or Home Depot get a valve that matchs up with you gas. Is it Natural or L P you MUST match the proper gas valve to the gas.

Make sure you test the gas connections with lots of soap an water for any leaks. Water leaks are no big deal Gas leaks will kill you and your family. I have seen with my own eye a house that gone after a gas leaked over night and they turn on a light and it was all over for 3 people BE VERY CAREFUL

Thanks Richard

Hello,
You may have a leaking gas valve control. Make up a squirt bottle of soapy water (use dishwasher soap and water) and spray the On-Off-Pilot knob for leaks, as well as the pilot button. Look for bubbles forming. Also check all the gas line fittings and connectors hooked up to the water heater for leaks. If you are smelling gas, do not attempt to relight the water heater. Close the shut-off valve on the gas line and see if the gas smell goes away. If it does, you may have to replace your gas valve. Depending on the age and condition of your water heater, it may be more cost effective to replace the control or buy a new water heater. Reliance is a common brand sold at stores like Lowe's. Typically, parts like your gas valve will usually only have a 1 year warranty. Check the manufacturer decal on the tank to see what their actual warranty period is. If you find a leak on the gas line itself, you will have to turn the gas off at the natural gas meter before disassembling the line to fix it. Use a soft setting teflon based pipe dope for the pipe threads. If you are uncomfortable doing the work yourself or don't know how to proceed, then call your local gas supplier for help. Douglas

Yes it can be replaced. This is a temperature/pressure relief valve and is the second most important safety device on your heater. They rarely make racket. Is it leaking? if so yes replace it. Water heaters should have a portion of water drained annually along with operating the relief valve. IF you raise the handle a few times, and it continues to leak, then it should be replaced. If you replace it be sure to replace it with EXACTLY the same temperature and pressure rating that is on it now. Allow the water heater to cool, and drain pressure before removing. If it is rumbling inside, you might have calcium deposits bouncing around in the bottom. Drain some water and see how it looks. (Often if you operate drain, and haven't in a long time it won't reseal)

You have to fix this leak around the water valve before
it causes damage to your equipment.
1. Close the water supply valve going to your tankless
water heater.
2. Unplug or close the natural gas valve.
3. Now, you can work fixing the leak.
4. Once completed, you can proceed to open the
natural gas valve as well as the water supply valve.
5. Then, have it tested to get it done.

5.

if it is leaking behind the handle take the nut off remove the handle and tighten the packing replace the knob and your done,, good luck

it sounds like the gland on the valve is leaking unusual in a valve so young but it does happen. is the valve electrical operated or water pressure. you should be able to get a complete diaphram kit with all seals etc .