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Old 07-27-2011, 01:04 PM   #1
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"Hot" is hot and "cold" is hot!


I have been having a water temperature problem. It affects the entire branch circuit supplying a 1st floor powder room and upstairs bath. The bath has a Kohl_r single handle mixing valve with a separate selector for side spray/shower/both. Both sinks cold supply [up and downstairs] run hot for a few minutes. The upstairs toilet fills with warm/hot water. The cold water supply pipe in basement is hot a few feet outside the wall. Happens all day/any time of day. Seems to be getting worse. After hot water is "flushed" out, water runs cold, but after only a few minutes it will be hot again?? It has some sort of scald prevention in the single handle fixtures, downstairs sink and upstairs shower. Upstairs sink is two handle version. All Kohl_r brand. No new work has been done on this branch. The fixtures were all put in the same time and worked fine for about ten years...maybe something in the "mixing valve"?

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Old 07-27-2011, 02:40 PM   #2
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"Hot" is hot and "cold" is hot!


Sounds like a bad moen cartridge in one or more faucet.

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Old 07-27-2011, 07:03 PM   #3
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"Hot" is hot and "cold" is hot!


If you have an expansion tank on the hot water circuit it could be a failed expansion tank--as the heated water expands it is forced into the cold line.
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Old 07-27-2011, 07:44 PM   #4
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"Hot" is hot and "cold" is hot!


Thanks, Expansion tank is on cold side, checked pressure OK.

changing the valve parts seems to make sense.
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Old 07-27-2011, 08:15 PM   #5
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"Hot" is hot and "cold" is hot!


This sounds so much like a problem my daughter had in a rental duplex she owned. I hunted the source of the problem for two days, checking all the piping and connections I could think of. The I pulled the fridge out just to look behind it, and clean it, and found a place on the drywall with four screws to remove it. This was also common to the back of one of the bath lav's piping. After I removed the piece of drywall I found a "temperature control valve" which was connected to both the HOT and COLD water lines. This could be set to control the temp of the water at the lavatory in the bath. But--it was leaking and allowing HOT water into the COLD water lines. After I removed this control valve, capped off some lines, and reconnected some others, all was well. So maybe there is a "temperature control valve" somewhere. Just a thought.
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Old 07-27-2011, 08:56 PM   #6
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"Hot" is hot and "cold" is hot!


Quote:
Originally Posted by PhillyDIY View Post
Thanks, Expansion tank is on cold side, checked pressure OK.

changing the valve parts seems to make sense.
I assume that you depressurized the system and then checked the expansion tank precharge.

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