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Water pressure in shower decreases when you turn it to hot. Was not like that in the past. Just started in the last few weeks.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 171 Answers

SOURCE: shower too hot

Hi sallypenn

I'm Harvey the Master Plumber.

Your question seems to be how to adjust the temperature of a shower valve?

I'm going to assume this is a single handle faucet. Most are adjustable under the handle. This is the responsibility of the installer but sometimes they forget and you can't get them back. Anyway this requires a little mechanical ability and a few tools.
First be sure to turn off the water to the faucet, then remove the handle (allen wrench or small screw driver). Most have a temp. adjustment ring right there. Simply pull out, rotate and replace. With some you have to remove the sleeve or bonnet under the handle to expose the adjustment fitting. Reasemble and turn on. It is not uncommon to have to do this two or three times before the customer is happy with the setting. The adjustment fittings usually don't have tenp. setting numbers to go by so it might take a few tries.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

Posted on Sep 10, 2008

  • 374 Answers

SOURCE: Not enough hot water

Some higher end models do have an adjustment that is behind the face plate. You would have to remove the handle and the screws in the faceplate to expose them. If you have adjustments they will be located on the brass valve body facing you. You will need a flashlight and a flathead screwdriver to make the adjustment. If your model is not equipped with adjustments you could have a faulty valve stem. The stem is comprised of a rubber band like gasket that separates port holes into which the waters flow. There could be some piece of trash blocking the port not allowing adequate water from the hot side into the valve.Some valves stems are also able to be installed upside down causing the same issue as the ports do not rotate fully to allow adequate supply. However you say that you have adequate pressure on the hot side but not warm enough. There is another possibility also based on the way the shower supply was plumbed but there is no need to go into this unless this does not resolve your issue. I hope this is of assistance and thanks for using Fix Ya. Please let me know if I can be of further assistance.

Posted on Oct 21, 2008

  • 1 Answer

SOURCE: moen posi-temp for shower pressure

There is a little "o" ring in the shower inlet that is designed to collapse as the pressure increases, limiting flow. You can safely remove this and then have un restricted flow.

Posted on Feb 24, 2009

  • 4 Answers

SOURCE: No water coming out of shower

First you should check the screens st the ends of the hose to be sure they are not clogged. The shower head as well. Otherwise it could be the water control valve, solenoid or thermal cut off.

http://www.theshowerdoctor.com/shower-spares/gainsborough/energy-2000x.html

Posted on Mar 03, 2009

  • 81 Answers

SOURCE: pulsating water and poor hot water pressure

Based on your description it sounds like the pressure balancing valve could be gunked up with particulate from your well or just worn out. If your water is not filtered to that shower I would lean more towards particulate. Try to remove the cartridge and take it to a plumbing parts store for a match-up since Delta makes several cartridges and you want to get it right the first time.

Posted on May 29, 2010

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Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

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This sounds like a problem with the flow switch(es) that control the operation of the pump motor.

When the pressure decreases I assume that the pump has switched itself off - check this before going any further, but I will assume that this is the case. (If the pump is still running when the pressure decreases then you have a really strange problem and I would need to think again).

The pump motor is controlled by flow switches on the outlet side of the pump - when the shower valve is opened the flow of water activates a switch that supplies power to the pump motor. There will be one flow switch on the hot outlet from the pump and another on the cold outlet.

I assume that one or both of the flow switches is not operating correctly. This can be either a fault with the switch(es) or insufficient water pressure on the inlet side. Has anything changed that might have reduced the pressure on the inlet side of the pump? Have you moved the water tank that supplies the pump? (cold water storage tank)

If there is adequate pressure on the inlet then one or both of the flow switches is not working correctly. To further diagnose the problem try turning the shower valve to cold water only and test the operation of the pump, then turn it to hottest and test again.

If the pump operates correctly on cold only or hot only then the associated flow switch is OK, and the other one is faulty.

Replacing a flow switch is not difficult if you are reasonably handy, and I am happy to provide further help if you need it.

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