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  1. #1
    Join Date
    Feb 2010
    Location
    Philadelphia
    Posts
    9

    Default Water Pressure Mystery

    I can't figure this one out. When I turn on my shower/tub (single lever pull system), the pressure starts out great. Then, after 20 seconds or so, the pressure reduces by half. No other faucets have this issue. So I have already replaced the shower cartridge (didn't help), cleaned the shower/tub diverter (didn't help), and replaced my shower head (again, didn't help). I recently had my hot water heater replaced, but the pressure was fine for months afterwards. I also have a natural gas boiler/radiator heating system, but no water is being drawn to it. If anyone has thoughts on other possible causes and solutions, I would be very thankful.

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Water Pressure Mystery

    Does this matter what time of day?

    Are you on a well?

  3. #3
    Join Date
    Feb 2010
    Location
    Philadelphia
    Posts
    9

    Default Re: Water Pressure Mystery

    Thanks. I'm not on a well. My neighbors haven't experienced anything similar. Also, the time of day doesn't seem to affect the issue.

  4. #4
    Join Date
    Dec 2012
    Location
    New London County, CT
    Posts
    120

    Default Re: Water Pressure Mystery

    It could be the pressure balancing part of the shower valve. I don't think that is part of the cartridge. You could look at a parts diagram for that unit and see if it could be the problem.

  5. #5
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Water Pressure Mystery

    Take the escutcheon plate from the valve assembly and snap a picture. A model number would be handy

  6. #6
    Join Date
    Feb 2010
    Location
    Philadelphia
    Posts
    9

    Default Re: Water Pressure Mystery

    Thanks, all. Last night, I checked on my hose fixtures to ensure that they hadn't frozen and punctured. While that wasn't the case, I noticed that the problem exists on these too. It seems as though the problem is easily seen on faucets that don't have aerators. Therefore, I think there is an issue with the main feed line. Thoughts?

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