Hello,
I am very sorry that you are having a issue with your Delta shower faucet. Our cartridges are pre-set from the factory. However, the adjustment of the rotational limit stop can be done to allow hotter water. This information is listed in the instructions and it is easily done from the front of the shower faucet. You can contact us for further assistance with this. We can be reached at 1-800-345-3358 or customerservice@deltafaucet.com.
Best regards,
Brandis