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Old 07-31-2011, 09:46 PM   #1
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shower hot then cold then scalding


Hello all,
Im having a problem with my new home. In both showers, the water will run fine for awhile, then get cold for 2-3 seconds, then scalding hot for 2-3 seconds. I've checked that noone else is using water, and turned off any valves to other places I can with no change.
When we moved in, the water had sediment in it, im guessing since the house sat empty for over a year. It seems to have flushed through now, but could that be causing a problem in the water heater?

Thanks for any advice you may have.

Timm

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Old 07-31-2011, 09:54 PM   #2
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shower hot then cold then scalding


if they are pressure balance valves the pressure balance pistons/plungers might be sticking. are these single handle valves that rotate?

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Old 07-31-2011, 09:55 PM   #3
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shower hot then cold then scalding


Yes they are single handles.
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Old 07-31-2011, 10:16 PM   #4
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shower hot then cold then scalding


My concern about that is, would both of them have the same problem? We just bought the house so they might have had the problems at different time n the past. They do appear to be the same model.

Thanks again!
Timm
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Old 07-31-2011, 10:29 PM   #5
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shower hot then cold then scalding


they could have gotten sediment in them. i remember having to fix one that was stuck in a place that had sat for a while unocccupied and the piston/plunger was stuck. can you post a picture? they might just need to be taken apart and cleaned out. its been a while since ive had one apart but i remember the holes in the pressure balance plungers werent very big. have you tried turning on the water and then flushing a toilet to see if the water temp changes at all?
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Old 07-31-2011, 11:58 PM   #6
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shower hot then cold then scalding


Let me know what you would like pictures of
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Old 08-01-2011, 09:23 AM   #7
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shower hot then cold then scalding


The first thing I'd do is lower the temperature on the hot water heater. The scalding issue is dangerous and wastes energy. The aquastat has markings on the dial. Drop it to the next lower marking and use it for a few days. If it's still too hot, drop it again. In the Summer you can set it to 100-105 and be fine. When the cold weather arrives, you might want to go to 110.\
If the issue is only in the shower controls, I'd shut off the water and disassemble the controls, one at a time and check for debris and make sure all the "O" rings are there and properly seated.
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Old 08-02-2011, 11:22 AM   #8
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shower hot then cold then scalding


looks like a moen. id replace the cartridge and that should fix your problem. someone might have changed the cartridge once before and not installed it correctly.

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