I have a Delta scald guard shower faucet (older model). The cold water pressure is good but as a turn to hot the pressure drops to a drizzle. There are 2 other sinks and another shower upstairs and there is no problem with any. Could there be a problem with the valve mechanism in the hower faucet?

• The spool and sleeve, the part of the Scald-Guard pressure balance valve that blends the hot and cold water, is not working properly. This can is caused by mineral deposits that build up over time resulting from hard water. To fix this, follow the steps below based on your model.

1. Shut off water supply.
2. There are two types of valves. Choose one or the other below depending on your series.

• 1300-1400 Series: Remove handle.
• 1700-1800 Series: Remove temperature knob, cover and handle.

1. Twist and pull sleeve to remove it.
2. Unscrew brass bonnet nut.
3. Remove cartridge.
4. Soak cartridge in a 50/50 vinegar and water solution for 24 hours to remove any mineral deposits.

• **NOTE** Unless both hot and cold water supplies are turned on, the pressure balance valve will allow only a dribble of water to flow through the valve.
• I have put up a picture to make disassembling it just that much easier for you.

Regards, Tony

When a Delta Scald Guard will not turn off, more than likely it is because the seats have worn out. Turn off the water supply and open any faucets lower stream of the shower unit. Using an allen key, locate the set c=screw in the handle and back it out. Next,Remove the Phillips screw holding the handle in place.Next turn the retaining ring counter clockwise and pull the catridge out of the faucet.Some catridges have two parts front and back. Behind the back part id two small rubber washers called seats and two springs. Install two new seats and springs and everything else in reverse order.

Not hot water should not exceed 120 degrees. If it does it will continue to melt the seats.

you need to take the handle back off and adjust the dial for the scald guard feature

probably have a kink on how water line feeding valve..if possible to cut drywall bhind tub valve and inspect pipe at bottom plate...moen faucets are equipped w/ anti scald device, pressure balanced (newer models) and this could cause cold water to overwhelm hot water...

The Delta shower has a rotational limit stop designed so that when another fixture is activated, such as a toilet or dishwaser, the water does not go to extreme hot or cold. The reason for this is that the Delta shower unit is not pressure balanced or does not contain an anti scald device. The pdf document below will show how to adjust the water tempature if you feel it is too cold. Please use caution as it is probably set the way it is to prevent scalding.

http://www.deltafaucet.com/media/Product_Tech_Docs/Maint_Installation/50001to80000/51975RevH_4.15_15e05.pdf

It sounds like it has mineral deposits in the hot water side. Try taking the internal valve parts completely out of the fixture and examine them. If there is any scaly (light grey) deposits, that would be the problem.
The solution is to soak all the parts in vinegar, which will dissolve the mineral deposits. It takes awhile to dissolve what has taken long to build up, so heat the vinegar, or put it all on a warm, not hot, surface to keep it more active.
I had this problem, and after cleaning it a couple of times with vinegar, I changed out the Delta to another brand. You could also use a water softening unit, which replace calcium and other metals with sodium, thus eliminating the mineral deposit problem.

porbably needs new mixet valve

With these Faucets, you can remove the handle and make adjustments to the max Hot water setting (scald guard).

You may also have a faulty or lime-covered cartridge.

SEE THIS SITE for making adjustments/replacing the cartridge.

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You need to check the age of your water heater. If it is pretty old, it can be sloughing off debris that can get caught in the hot side of the faucet. You will need to turn the water off to the unit, remove the guts. While someone is turning the water on slowely, flush out the the valve. Take a flashlight and check for debris that is caught. I have spent a few hours digging out debris from water heaters before. After you have done this and your still not getting water, check the scald gaurd for the right temp. Typically these don't just "jump" out of adjustment on their own because they have a small retaining washer that holds them in place. I doubt it is the scald guard if everything was working just fine before. Plus, the bath faucet has the most flow than any other faucet in the house so this will be the first place that debris will usually travel. Good luck

Sounds like you have lost pressure on one side of the valve. ( either hot or cold ) Or the cartridge has gone bad. If you have hard water if probably is the cartridge. There are a couple of different series for your style of faucet.

The reason why you only get a few drops is the cartridge is pressure balancing. It is a safety device which prevents scalding if one side of the supply shuts down.

Please rate this response and Good Luck, Phil