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Plumber reversed the hot and cold lines during installation

My plumber reversed the hot and cold lines during installation of Amst.R110 rough valve.
Can the cartridge be reversed?

Thanks Fred

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Yes it can but I believe only the Pressure Balance Unit needs reversed.

1) Turn off water supply to unit
2) Remove handle/trim if installed
3) Remove cartridge by removing 3 screws holding cartridge
4) Remove retainer ring holding in P.B.U. in valve body by removing 3 screws
5) Remove Pressure Balance Unit, rotate 180ﹾ and reinsert
6) Reassemble in reverse order

Posted on Dec 31, 2008

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I am not familiar with that valve, but I hope I can offer some help. It may be that you installed the valve upside down. Every shower valve I have ever installed has writing on the back that says; UP. If you still have access to the rough-in valve, you may want to check that. Also, if it is installed upside down, you can try to pull the cartridge, flip it and reinstall it. That does not work with all cartridges, but it is worth trying if the rough-in is installed upside down.

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The hot and cold are reversed on our single handle shower (no tub faucet -- shower only)


Hot on left.
Cold on right.
Some single handle faucets have bleed-over where both hot and cold enter mixing valve each time handle is turned on, even when faucet calls for just cold or just hot.
Otherwise maybe a do-it-yourself plumber got pipes backwards... or maybe the tub used to be on other side of wall, and tub was moved during remodeling but pipes were not changed.

To fix problem:
First of all, turn off shower faucet. Turn on Hot at sink and put ear against shower faucet listening for sound of water flowing through the mixing valve.
If mixing valve is working fine, you need to open wall and investigate more.
For example if you have access door, reach in and feel which pipe is hot.
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SINGLE VALVE SHOWER FAUCET TURN ON TO GET HOT WATER ONLY GETTING WARM WATER LUKE THE OTHER TUB AND SINK FAUCET COME OUT HOT HELP PLEASE


I can think of a few possibilities. 1) Something is blocking the hot water in to the mixing valve. Fixing this would probably mean cutting out the valve (then redoing the water lines with a new valve (possible option)).

2) The hot water line is losing too much heat going to this second faucet. (If the two tubs are on different floors this is more common. Many places are plumbed with one line with Ts to all fixtures.) Insulating the water lines might help; alternatively an point of use water heater would help.

3) The hot water and the cold water in are reversed. (Test by leaving the water on full cold and full hot for a few minutes each.) If you get full hot when it should be cold, valves with a cartridge are easy to fix. Open the valve assembly, remove the cartridge and reinsert it after turning it around (side closest to you when you removed it goes in first). Otherwise, the incoming plumbing needs to be redone at the point where the cold and hot lines come into the shower.

I hope this helps.

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Very little cold water from shower valve


If this is a new installation and has always beenj this way, then I would suspect that there may be an obstruction in the cold water line leading to the valve. Or something stuck in the valve at the point where the cold water is connected. If someone has worked on thius valve recently , then I would suspect that they got the valve cartridge in backwards, If the catridge is not placed in the valve correctly the opperation is messed up.

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Hi,

If the hot and cold are fitted the wrong way round then the thermostat on the shower unit cannot operate properly!

Most thermostatic mixer showers have a 'bi-metallic' thermostat, if you supply the hot to the cold and vice versa IT WILL NOT WORK.

It is like wearing the left shoe on the right foot and the right on the left! It doesn't work.

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Water turns from hot to cold


The valve stem has been turned 180 degrees allowing the ports to be on the side opposite the display on the chrome trim. This is a simple solution. Cut the water supply off to the valve, and bleed the pressure off the valve, remove the handle,remove the chrome extension tube behind the handle, pull the brass clip out of it's slot, spint the valve 180 degrees and reassemble. If you have an issue gaing access to the valve cartridge to turn it 180 degrees put the handle back on and carefully pull the cartridge out and turn it 180 and reinsert. This will resove your issue so that the hot is on the left and the cold is on the right. There is one other possibility and that is that the supply lines were reversed when the shower was roughed in. Either way the 180 tiurn will fix the issue. Thanks fo using Fix Ya.

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