Cold shower

Does sound like a Hot\\Cold transfer. The 1220/1225 is not a scald-guard type so it's not that kind of problem. It's remotely possible that the cartridge is not sealing properly in the bore, but I doubt it.

Have you overlooked some faucet/device which could be backfeeding Cold to Hot? A single handle bath faucet nearby? Another shower/tub faucet? Even a washing machine solenoid valve?

hello Keith,

I would try seeing what hot water flow rate you get at the shower.

Put a small bucket under the shower and run only the hot water for a timed minute .

That will show you if there is some constriction problem.

Do the same for the cold water to compare.

If you get very hot water from another faucet its not a heater problem.

This would mean the entire assembly would have to be replaced? Oh my aching drywall. :-( I already had to tear out the ceiling below because of a leak (turned out to be the drain and caulk).

I put ball valves to cut off each room/device last year. I shut them all off and took a shower. ;-) No change. :-(

I'll do that, though there doesn't seem to be a problem with the sink in that bath (I'll try that too just to make sure).

It can't be a constriction after the mixing valve (would be the same as a "saver" shower head) or before the split to the sink (assuming the hot isn't a problem there). There is only about a two foot long piece of 1/2" copper inbetween (the connection is directly under the head-end of the tub).

Isn't this fun, owning a house? This is much better than relaxing on the sofa with a good book, playing golf or fishing, ya know? :-)

Hot enough for SWMBO. When the ground gets cold the bath in question may not even be enough for me.

The bath in question is a long way from the boiler (30-40') of

You don't even want to know! This house was built by a complete moron. I just took the red carpeting out of the bath in question and put down tile.

Actually, I'm getting ready to sell the house so I've got it *all* torn up fixing things that I should have years ago. It seemed that happened with my last house too (got everything all nice and pretty for the next owners).

Yep. Not much of that stuff in my immediate future but once I sell the joint...). ;-) Got the outside stained and now the only thing I need to do outside is some repairs to the deck before the snow is

Only complete fools put carpet in a bathroom. Really.

Is there a possibility that some sort of water filter (strainer screen) may be partly clogged on the hot water side?

It was a master bathroom so supposedly no kids, but you're getting the picture.

To followup: I measured the downstairs bath (working fine) and I get 3.5GPM (hot) and 5.0GPM (cold). These number seem rather reasonable to me.

There is a possibility of anything. Where?

Unless I've misread, you say the faucet worked, but now performance has degraded. That would seem to indicate that recently something has been misadjusted, clogged, or broken.

I think you said you recently put in ball valves. My suggestion would be that you go through the entire system and insure the valves are in the proper position, whether it be open or closed. If there is another faucet on this supply line, for example, having a valve that should be closed open can allow bleeding of cold into the downstream hot, giving downstream tepid water. I suggest doing this first, as it is simplest.

If that doesn't work, I would close the ball valves lead> The shower in my master bathroom is no longer staying hot. It's

Yes, something's changed. But what? There isn't much in line that wouldn't also affect the other bathroom.

Yes, I mentioned this. I shut everything else off and no joy. This line is the only one I haven't yet added ball valves to.

That's not easy to do since I'd have to add the ball valves to this line. I have them, but haven't installed them yet. This is a good idea though. If everything is shut off except that hot then there is no chance of intermixing and then the flow rate would tell me something, even without pulling the cartridge.

Perhaps a call to Moen might be in order...

Thanks all!