Water Heater Relief Valve keeps opening.?

My electric water heater relief valve keeps opening 30 min after turning it on.I turned it down to 90F and 30 min later overflow again.when power is off no leak with the water on.could the valve be opening because of over heating?I know it does'nt leak with cold running through it.

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  • 10 years ago
    Favorite Answer

    First you need to replace the relief valve. Once it opens, sediment sits in there and it will not shut off properly. If still happens after that, two things may be happening: either too much water pressure, or thermal expansion.

    -Check if your water main has pressure reducing valve, a check valve or a backflow preventer installed by the water meter, and make sure they're working properly.

    -If too much water pressure coming in to the house you need to install a pressure reducing valve in the water main, then you'll need a thermal expansion tank by the water heater.

    -If none of those item are installed by your water meter, most likely is only thermal expansion, and a thermal expansion tank will do the job.

    Source(s): Licensed Plumber
  • cina
    Lv 4
    4 years ago

    the city could have put in a verify valve on the meter to maintain water out of your equipment from backing up for some unknown reason and contaminating the municipal water furnish. whilst the chilly water interior the heater receives heated from fifty 9 to one hundred twenty five levels it expands somewhat. perhaps a cupfull. without place to pass, it opens the relief valve. you would be able to ought to deploy a style tank close to your water heater. that's a metallic tank a pair of gallon in length with a bladder interior packed with air. i don't have one, yet I word a brilliant variety of properties have them now. additionally decrease the drain so which you comprehend it relatively is not plugged or leaking.

  • 10 years ago

    Sometimes I find that the relief valve is not working correctly and needs to be replaced. They tend to get a buildup of minerals from the water that interferes with proper function.

  • 10 years ago

    sounds like you may have a bad high limit/thermostat. replace it and it should fix your problem. the valve keeps popping off because of the pressure build up from the bea high limit

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  • Anonymous
    10 years ago

    after a few years they just go bad, replace it.

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