Boiler’s T&P valve keeps popping

Discussion in 'Water Heaters and Softeners' started by H2oheartny3, Mar 13, 2018.

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  1. Mar 13, 2018 #1

    H2oheartny3

    H2oheartny3

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    I have hot water heat(standing radiators) in my house and I bled/filled my water lines about 1/2 way through the winter and ever since my t&p valve occasionally pops and is slowly filling a 5 gallon bucket. I have to empty it about once a week. I’ve tried draining some of the water from the boiler. The pressure valve starts at 20psi, but ends up going up to about 50 during heating and pops. Any help plz!!
     
  2. Mar 13, 2018 #2

    TomFOhio

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    it sounds like your pressure reducing valve is letting the boiler fill. Wants it gets to 30lbs the relief valve will pop off. Do you know what part I am talking about??
     
  3. Mar 13, 2018 #3

    johnjh2o

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    Sounds like the expansion tank needs draining.
     
  4. Mar 13, 2018 #4

    H2oheartny3

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    It’s the pressure relief/fast fill valve??
     
  5. Mar 14, 2018 #5

    voletl

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    Check to see if your expansion tank is full of water could have popped may need to be replaced along with a new relief valve
     
  6. Mar 14, 2018 #6

    johnjh2o

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    He has a system with standing radiators. There is a good chance he doesn't have an expansion tank with a bladder. It may be a steel tank hanging between the floor joists.
     
  7. Mar 14, 2018 #7

    voletl

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    I've seen both should post a picture this is what we're looking at
     
  8. Mar 14, 2018 #8

    H2oheartny3

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    That’s right I’ve got a steel compression tank, not one with a bladder
     
  9. Mar 14, 2018 #9

    H2oheartny3

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    Sounds like I’m going to drain the expansion tank, purge my system, and change out my pressure reducing valve. Right now I’ve got the FB-38... do you guys have any feedback on what brand/style of valve I should get??
     
  10. Mar 14, 2018 #10

    johnjh2o

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    If the water pressure only increases when the boiler is running and not when it's off it's the expansion tank, not the auto feed.
     
    Matt30 likes this.
  11. Mar 17, 2018 #11

    Geofd

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    the last poster is right just drain the expansion tank and see what happens
    my brother in law calls me every year and says the same thing.....just dain
    it couple of times during the heating season........
     

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