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Old 12-09-2007, 07:26 PM   #1
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Hot water pressure in the shower


Suddenly our hot water pressure in our master bath shower has gone way down. The pressure is fine when the cold water is running. The pressure is fine in the sinks for both hot and cold in the same bath. If the valve is turned to the hot the pressure drops then??? Any help would be great.

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Old 12-09-2007, 07:29 PM   #2
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Hot water pressure in the shower


There's probably something jamming up the mixing valve. Shut off the supplies to the shower, remove the cartridge, give it a good shake, and clean out anything that doesn't belong.

I think that's how I'd start. Any tips from the pros?

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Old 12-09-2007, 07:53 PM   #3
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Hot water pressure in the shower


Ayuh,......... It's Got to be the Faucet......
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Old 12-09-2007, 08:36 PM   #4
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Hot water pressure in the shower


While you have the cartridge out is a good time to slowly open the hot supply and make sure you have a good flow. If there is any more trash in the line this will flush it out.
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Old 12-09-2007, 10:20 PM   #5
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Hot water pressure in the shower


You haven't said what brand of faucet you are dealing with. It really matters. Some brands of washer less systems have a pressure balanced cartridge that will fail (moen posi-temp for example) and then no hot water. What is the brand...is it compression or washer less?
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Old 01-02-2008, 04:44 PM   #6
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Hot water pressure in the shower


Its a Price Pfister with just a one lever system. The cartridge I think is compression, but I just replaced it and it still doesn't work. Not sure where to go next.....
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Old 01-02-2008, 05:03 PM   #7
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Hot water pressure in the shower


I've got the same problem with my shower valve (also a price-pfister single lever type). Please keep this thread updated if you discover the cause of the problem.

I wonder if this indicates a systemic quality problem with Price-Pfister hardware?
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Old 01-02-2008, 05:06 PM   #8
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Hot water pressure in the shower


I sure will and if you figure out anything let me know also...I'm so frustrated with this.
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Old 01-02-2008, 07:46 PM   #9
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Hot water pressure in the shower


You could have dip tube from the water heater plugging up the valve (in back of the cartridge) if it is only the hot side not working...btw, if it is single lever it is washer less on price pfister.
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Old 01-02-2008, 07:53 PM   #10
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Hot water pressure in the shower


Reply....Is there a easy way to clean out the dip tube?? All I see behind the cartridge is the copper piping. One hole for the hot, one for the cold. The cartridge does have two washers on the back. One for the hot and one for the cold.
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Old 01-02-2008, 07:59 PM   #11
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Hot water pressure in the shower


if it looks all clear then you need to see if you have pressure through the hot side without the cartridge and without any isolation valves you will probably need to just ease the water on from the main and visually see if it comes out the hot side and maybe put your finger over where the cold water comes out and feel the difference....my guess is there is something stuck in there

Last edited by jpplumber; 01-02-2008 at 08:06 PM.
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Old 01-02-2008, 08:03 PM   #12
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Hot water pressure in the shower


and it may not come out from where the cartridge is so you will end up cutting the valve out and installing 1/2" ball valves on the hot and cold supply lines and testing from there without the shower valve involved
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Old 01-02-2008, 08:44 PM   #13
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Hot water pressure in the shower


Sounds like I need another plumber. I see your in Texas. Anywhere near Flower Mound?? It really seems like you know what your talking about. Thanks for your help and your ideas. I guess the best way to do this is to work backwards to see what it blocking it.
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Old 01-02-2008, 09:23 PM   #14
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Hot water pressure in the shower


Sorry, I was busy on another thread...I sent you a private message as I don't want them to think I am soliciting business even though you asked. Let me know if you get it or not, check up by your name in the top right corner on the plumbing main page.
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Old 01-02-2008, 10:00 PM   #15
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Hot water pressure in the shower


I got your message and I'll probably call soon. I couldn't reply because I don't have enough threads or something.....Thanks.

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