We have a Maxx shower SA9592-02. The water comes out scalding hot with no control over the cold. Do we need a new themostat for the shower? The shower was installled by our plumber in a new home and he did not leave us the owners manual to look up parts or fixes.
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You have the scald guard set to high. Take off the handle and the face plate. You will see a small plastic half moon looking part with teeth. Yours is probably set all the way one way which keeps the cold water side restricted and the hot side fully open. Carefully pull the half moon part out and rotate in about halfway and reinstall. That will give you equal cold and hot water flow. If that isn't right for your needs, you can play with the settings.
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.
if you have anti scald device installed in the valve, take it out. the anti-scald device is to keep the hot water from pouring out in case the cold water pipe is not functioning. In general sense, it is a good idea, however, it also mixes too much of cold water, therefore you don't get eough hot water.