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The pressure release valve keeps engaging and running all of the hot water out of the tank

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If this is a water heater, replace the valve. You can get them at Home Depot. If it is an air conditioner, don't worry about it. The water is supposed to run out.

Posted on Jul 27, 2008

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Hot water leaking from what i think to be the pop off valve. i tried to tighten it a little and it started leaking more. The unit is 16 years old. The excess water is draining into the catch pan and then...


Hello
16 yrs old? Im guesing this is a hot water heater.Not a air conditioner.

If its still making hot water you may not need to replace the whole unit.
The valve that is leaking is a high pressur relief valve and they do go bad the sprigs become weak over time and some corrosion may not allow the valve to seat properly.

1st step is to shut off all incoming and out going water to the tank.
2nd Shut off fuel or gas to the unit, and annonce to everyone your are working on the hot water heater.
3rd at the very bottom should be a drain valve much like a hose spicket,open this slowly and drain the tank,remember the water will be hot.You may not need to drain it all the way,while draining pop open the relief valve,when you stop getting water from it,you are below it and can turn the drain valve off.
4th remove old relief valve and replace with a new one,i think they are rated at 15 psi or 30 psi blowoff pressure,hopefully there is a tag on it with that info.

When you go to install your new one use some pipe thread compound or teflon tape around the threads before you reinstall valve.
Once done slowly refill tank with water, check for leaks.When full open up hot water valve to house and relight buner.open a faucet in kitchen to hot to bleed off any air.

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1 Answer

Yesterday my ariston boiler made a loud noise and water burst out from the boiler what can be the problem?


Hi,
The pressure built up in the boiler and the relief (safety) valve released some water to relieve the pressure...
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Sounds likes you have a hot water system. Some where you have an expanion tank that is full of water and it should be half full. It will a round tank above the boiler and may even have a site glass on the end off it. It will have a special valve on it to lower the water level in the tank. The tank is to absorb the expanding water as it gets hot, and releases it when it cools down therefore preventing your relief valve from popping off.

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