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The water in the shower is either hot or cold; I cannot get any temperature in between. What is wrong?

The spool and sleeve, the part of the Monitor pressure balance valve that blends the hot and cold water, may not be working properly. This can be caused by mineral deposits that build up over time, resulting from hard water. To solve, follow the steps below based on your model.

Tools you may need:

Do you have any special instructions for installing Monitor valves back-to-back?

Back-to-back installations require that the pressure balancing cartridge be "flipped" or rotated 180 degrees in order for both units to function properly. Flipping the cartridge will reverse the hot and cold water supply lines so that the faucet works like a traditional hot/cold unit. The cartridge may also be flipped to correct a hot/cold reversal resulting from connecting the supply lines to the incorrect sides of the valve.

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