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Delta Monitor: The Delta Monitor tub and or shower faucet, how to repair it and how to adjust the scald guard feature.

The Delta Monitor

It is not necessary to remove the back plate to replace the Delta Monitor cartridge. It is removed in the images because this faucet was just installed. If you have this type of handle you will need a very small Allen key wrench to remove the set screw that is in the base of the handle, just look for the little hole in the handle.

Delta monitor shower valve

This image is of a Moen Positemp shower faucet but the location of the set screw is in the same place as the Delta Monitor.
Remember you can click on the image to see a larger image. If you have the plastic ball handle remove the button with the Delta logo on it then remove the screw.
Note: If the process is not going smoothly, you may want to click here and find an affordable plumber in your area.
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Delta Monitor cartridge nut

Once the handle is removed you will need to remove the chrome sleeve, just grab it and pull it straight out towards you. it does not need to be turned, but turning may help it come out. Again the back plate does not need to be removed.

Delta Monitor cartridge

With the sleeve removed the nut will be exposed. this nut needs to be removed. be careful not to put too much pressure on the nut, if you are using channel locks you can squeeze too hard and end up pinching the nut causing it not to turn. hold the channel locks on the very end of the nut (closer to you) to avoid crushing the nut. The nut turns counter clockwise as you face it.
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Delta Monitor stem

With the nut removed, you can pull the old cartridge out. just grab it and pull straight out. if it is tight try using a small screwdriver between the cartridge and the brass body, being careful not to damage the brass body.

Remove Delta cartridge    Delta Motitor remove cartridge

Once you have it removed this far it should just come out. You may want to save some money be trying to repair the cartridge, but you will find that it is just a waste of time, get a new cartridge.
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Delta Monitor body

With the cartridge removed this is what the inside of the body looks like, this one has a fitting I have not seen in earlier models of the Delta Monitor tub and shower faucets

Delta Monitor strainer

It's a little strainer or screen. if your have lost pressure in both your tub and shower heat, this may be the cause. I'm sure Delta has a good reason for adding this screen, but I can not see it. I think it is easer to remove the shower head to remove sediment then it would be to clean out this screen.

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Delta Monitor scald guard    Set temp on Delta Monitor    Adjust Delta Monitor

To set the scald guard on the Delta Monitor, with the handle removed, there is a little ring, the ring does not come all the way out but it comes out enough for you to turn it Notice that it has gears on it turn counter clockwise a few gears for hotter water and clock wise for cooler water. keep testing till you have the hottest water you want then you are done replace the handle.

Important note. The water temperature coming out of the faucet will not exceed the maximum temperature of your water heater. If you raise the temperature of the water heater you will need to re adjust the scald guard feature on the Delta Monitor Faucet.