Cold water is hot?

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  #1  
Old 04-23-15, 01:46 PM
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Cold water is hot?

In my one bathroom, it seems that every time you turn on the cold water, its hot (really hot) for nearly 30 seconds before it turns ice cold. Any ideas??
 
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  #2  
Old 04-23-15, 02:13 PM
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I ran into something like that once. Inspect the piping. Look for a crossover somewhere. In other words, hot & cold pipes should be totally separate.
 
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Old 04-23-15, 03:26 PM
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Do you have in floor heating? Does this only happen during the heating season?
 
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Old 04-23-15, 03:30 PM
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Do you have a single handle tub faucet in that bathroom?
 
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Old 04-23-15, 07:20 PM
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As the water heater heats the water up..... the hot water expands out of the tank and back into the cold water line. If that bathroom is directly above the hot water heater then what I described is what could be occurring.
 
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Old 04-23-15, 08:20 PM
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No floor heating.

Yes, I have a single handle bathtub faucet
 
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Old 04-23-15, 08:27 PM
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I believe it may be above the water heater. So I am out of luck?
 
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Old 04-23-15, 09:27 PM
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You would need to have a check valve and pressure tank installed at water heater to eliminate the problem.
 
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Old 04-23-15, 09:48 PM
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I'm guessing the water line is in the attic and the roof heat is making it hot. Only fix is add more insulation in the attic.
 
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Old 04-24-15, 07:39 AM
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I stand corrected. The bathroom sits above the laundry room. The hot water tank is not in the same room but further away downstairs.

There are no water lines running in to the attic at all. Just electrical up there for what is on the ceiling below.

Can you give me links to this pressure tank and check valve so I have a better idea? What am I looking at cost-wise to install this?
 
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Old 04-24-15, 07:46 AM
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Usually its a mixing issue if no where near the water heater...

Can you post pic of the tub faucet?

Laundry mixer?
 
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Old 04-24-15, 07:58 AM
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When I get home I will get a pic of the tub faucet. What does the tub have to do with a sink? Just curious.

Whats a laundry mixer?
 
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Old 04-24-15, 09:29 AM
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What does the tub have to do with a sink? Just curious.
Hot water at the tub faucet leaks through the tub faucet cartridge into the cold line.
 
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Old 04-24-15, 10:39 AM
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Here is a pic of the tub faucet
 
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Old 04-24-15, 06:38 PM
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Looks like a moen positemp...

How long have you had this issue???

I would replace the cartridge first then let us know the outcome afterwards...

Possible the spool in the cartridge....

Note: water in the cold line needs a place to mix... usually its a cart issue....
 
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Old 04-24-15, 07:22 PM
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Correct me if I'm wrong, but the op is talking about his sink faucet. are you guys suggesting a bad tub cartridge could affect the sink?

Op. Do you have the same issue with the tub faucet giving only hot at first?
 
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Old 04-24-15, 07:25 PM
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Correct me if I'm wrong, but the op is talking about his sink faucet. are you guys suggesting a bad tub cartridge could affect the sink?
Yes... only place hot cold mixes is at a tub spout were the are balanced spooled.... There are other places but rare...IMO
 
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Old 04-24-15, 07:38 PM
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What about a single leaver sink tap though?
 
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Old 04-25-15, 02:03 AM
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Yes, I AM talking about my sink.

No issues at the tub.
 
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Old 04-25-15, 02:08 AM
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Nope. I have a separate hot and cold knob
 
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Old 04-25-15, 02:12 AM
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How long have you had this issue???

I would replace the cartridge first then let us know the outcome afterwards...

Possible the spool in the cartridge....

Note: water in the cold line needs a place to mix... usually its a cart issue....
Its been going on since we bought the house over a year ago.

What cartridge? Whats the spool in the cartridge?? What cart issue? You got to speak English for me sir as I am just a layperson here. Thanks!
 
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Old 04-25-15, 03:10 AM
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I ran into a problem where if you turned the diverter in the shower, it would put hot water in the toilet. That's why I mentioned a crossover.
 
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Old 04-25-15, 05:47 AM
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What cartridge? Whats the spool in the cartridge?? What cart issue? You got to speak English for me sir as I am just a layperson here. Thanks!
IDK if your shower valve is a moen. If it is, its not a posi temp model..

Usually the shower valves have a balance spool built into the cartridge of the faucet is why I stated to replace that first. That would be cheapest and easiest ti try first.

Cart= cartridge....

Remove the handle of the shower valve and take a pic so we can posibly identify the brand. Or tell us if there is a name anywhere..


Also look around the hot water heater for a pump. Possibly you have a recirc line. Often a check valve goes bad and causes an issue...
 
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Old 04-25-15, 06:40 AM
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Does your tub have its own set of shut off valves? If so, turn them of, and see if that solves the problem at your sink.
 
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Old 04-25-15, 07:38 AM
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Shut off valves are often built into tub faucets. Modern faucets aren't my thing but I have seen shut offs that looked like screws in the faucet body. Mike can better advise you.

An example:
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Source: diyadvice.com
 
  #26  
Old 04-25-15, 03:20 PM
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I dont know if it has its own shut off valves or not.


I could not find a name on this thing anywhere. I dont have caulking right now to reinstall it if I remove it.
 
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Old 04-25-15, 03:24 PM
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just remove handle and take a pic

Take pic of washer machine valve too.

Look near water heater for pump...

Let us know
 
  #28  
Old 05-01-15, 11:57 AM
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I should add on the other side of the shower there is the bathroom for the master bathroom and the sink there gives me no issues.
 
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