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Old 06-07-2015, 03:19 PM   #1
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Shower/tub water problem


Yesterday - all of a sudden - when using our bathtub/shower, the water pressure is fine for cold water - when we turn the knob to the left to warm up the water, we have to turn it almost 1/4 more than usual and the water doesn't "warm" - it immediately comes out hot. So we've taken some fairly lukewarm showers for two days. I replaced the cartridge today, but no difference. Any suggestions on something else we can try or advice on what could be happening?
Thanks for any answers!
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Old 06-07-2015, 03:49 PM   #2
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That is odd----
question--did you clean the valve body before you installed the new cartridge?

Has any other plumbing been done in the house in the last couple of days?
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Old 06-07-2015, 05:00 PM   #3
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Cleaned it out with my finger. No plumbing recently, no. I thought it was possible - but what are the odds? - that we bought a bad replacement cartridge?
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Old 06-07-2015, 05:29 PM   #4
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what material are the supply lines? copper, galvanized, pex, or cpvc
does your valve have shut of stops or do you have some form of shut of valve before shower valve
it sounds like your hot water side is clogged and the pressure balance cartridge is doing its job
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Old 06-07-2015, 07:34 PM   #5
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Pull the new cartridge out--roll up some fine sand paper and clean the inside of the valve body---then ,you will need a helper--open the house water for a moment and blast out the valve and whatever is clogging the pipe--

Lubricate the valve body and reinstall the valve---You might have a bit of the old cartridge lodged in a port---
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Old 06-07-2015, 08:52 PM   #6
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Are you lavatory faucets Moen single handle?
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Old 06-08-2015, 07:38 AM   #7
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Quote:
Originally Posted by Ghostmaker View Post
Are you lavatory faucets Moen single handle?
Yes it is.
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Old 06-08-2015, 05:35 PM   #8
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Are you lavatory faucets Moen single handle?

Under your sink turn off the hot to all your single handle moen faucets. Try the shower see if it stays warm. If it does turn them back on one by one until the shower gets funky. The one that causes the funk replace it's cartridge.

Moen singles can have a bad O ring in the cartridge that cross connects your hot to the cold then you get weird things happening.

Call Moen U.S. 1-800-Buy-Moen (1-800-289-6636) Free replacement cartridge.
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Old 06-08-2015, 09:42 PM   #9
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[QUOTE=Ghostmaker;2137626]Are you lavatory faucets Moen single handle?

Under your sink turn off the hot to all your single handle moen faucets. Try the shower see if it stays warm. If it does turn them back on one by one until the shower gets funky. The one that causes the funk replace it's cartridge.

Moen singles can have a bad O ring in the cartridge that cross connects your hot to the cold then you get weird things happening.

Thank you for your response. Unfortunately, our only Moen faucet is the one in the tub that is having the problem. Our sink faucet is a Grohe. We tried removing the cartridge as suggested above and cleaning out the pipe and turning the water on again and still no improvement.
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Old 06-08-2015, 10:06 PM   #10
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Quote:
Thank you for your response. Unfortunately, our only Moen faucet is the one in the tub that is having the problem. Our sink faucet is a Grohe. We tried removing the cartridge as suggested above and cleaning out the pipe and turning the water on again and still no improvement.
I would still try Ghost's diagnostic procedure just for giggles.
Moen's have this problem some times- though not often. Who's to say other brands may as well. It does sound like you are getting HW cross over from somewhere. It's possible at the clothes washer as well
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Old 07-17-2015, 03:09 PM   #11
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The continuing adventure of our plumbing problem


To add to what is happening with our shower plumbing, when we turn the water on and pull the little stopper on the faucet to make it go to the shower, it normally comes on ice cold and as we said above, to get hot water, we have to turn it way to the left and then the pressure goes down and we get a low pressure hot water situation coming out of the faucet/shower. BUT...and here's the kicker - every once in a while it will come on as normal- as if the problem never existed. This has happened a few times and seems to follow my wife using the hand held shower head to rinse the tub out. Normally we don't take the handheld out of the holder - but she does to rinse off the soap, etc. from the tub. Does this have any correlation to the problem??? Something to do with the handheld shower head maybe?
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