GE water heater controller voltage

Discussion in 'Water Heater Forum, Tanks' started by KeithR, Sep 14, 2013.

  1. KeithR

    KeithR New Member

    Messages:
    5
    Location:
    Ontario
    I have a 40 gal GE "Profile" "Smart" water heater, about 5 to 7 years old.
    Trying to trouble shoot shortage of HW,and discover voltage to the top element is 240v, but the bottom element is only getting 120V.
    Do I need to replace the top controller which feeds to the bottom one or is it meant to do this?
  2. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX

    What is your Model Number ?


    Good Luck.
  3. KeithR

    KeithR New Member

    Messages:
    5
    Location:
    Ontario
    Its a PE40T9CB00
    Actually closer to 10 years old.
  4. KeithR

    KeithR New Member

    Messages:
    5
    Location:
    Ontario
    I think I need to study it a bit closer before jumping to conclusions. My first observation was with wires disconnected from both elements. I drained and re-fillled the tank.
    Now with the top element connected, there is zero voltage at the bottom element. Does the controller cycle back and forth so only one element is on at a time?
  5. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX

    Normally, Yes it does work that way.


    Did you have power off when you drained it ?
  6. KeithR

    KeithR New Member

    Messages:
    5
    Location:
    Ontario
    OH yes!
    I just checked resistance. Top is 20K ohms & bottom is 7K ohms. (They are supposed to be the same!)
    Both are infinity to ground.
  7. KeithR

    KeithR New Member

    Messages:
    5
    Location:
    Ontario
    So two new elements and we have hot again! Thanks for comments Rocket Scientist
  8. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX

    Good Deal.


    Enjoy.
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,292
    Location:
    Cave Creek, Arizona
    An element will ONLY register 120 v. when it is burned out. It also does not heat when that happens so only the upper element operates to heat the water at the top of the tank, giving you a short supply.
  10. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX

    Sounds like both elements were Open. If the posted readings are correct.

    That is a bit strange, unless power was applied with no water in the tank. Or one element has been bad for awhile.
    Last edited: Sep 16, 2013
  11. kahnman

    kahnman New Member

    Messages:
    1
    Location:
    Ontario
    Hi Keith. I am having the same problem with my exact same model water heater. I did a search of the model on the GE support and parts site and no results. Do you still have the element part numbers and where you ordered them from? Thanks.
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