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  1. #1
    Join Date
    Nov 2011
    Location
    Tampa, Fl
    Posts
    1

    Knocking noise in system

    We are looking at a Rheem system, heat pump. When it cycles off it begins a knocking sound after approx 3 min. Goes for 60-90 sec, slows down and then stops. It sounds like metal on metal. We have some ideas but are looking for input.

  2. #2
    Join Date
    Feb 2012
    Location
    Alabama
    Posts
    5
    Need model # and serial # of unit.

    where is the noise coming from?

  3. #3
    Join Date
    Oct 2002
    Posts
    1,327
    How long is lineset and evap and condenser same elevation?

  4. #4
    Join Date
    Oct 2005
    Location
    Atlanta GA
    Posts
    37
    Same issue last week on a Weather King (Rheem). Knocking was at outdoor TXV after shut down. All operating values were normal. This being an investment property with the owners wanting "the cheapest fix", installed a solenoid valve in the liquid line. Problem was solved.

  5. #5
    Join Date
    Oct 2002
    Posts
    1,327
    TXV=$70, Solenoid= $120. Cheaper? Guess less labor on Solenoid.

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,240
    Rheem knows about it. Likely will need a bleed type TXV put in the outdoor unit. Even then, might not stop it. We're 1 out of 2. I'll ask our tech rep about the solenoid idea.

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