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Delta shower faucet either too hot or too cold

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Sterlingrepairs

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After a plumber installed a Delta Multichoice valve with a single function cartridge, the shower gets hot water only if turned to max which is too hot. But if the handle is turned down just a little, the water is too cold. The plumber is blaming it on the water heater, but the other shower in the house works just fine. He replaced the cartridge with a new one and still the same problem. How can this be fixed?
 

Jeff Handy

Pro Handyman, NOT A Pro Plumber
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Contact Delta customer service for technical support.

Maybe there is a problem with the pressure balancing unit.

Does the new valve have service stops, if so are they both fully open?
 
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