Adjusting the temperature setting on a Delta single handle faucet 13/14 series.

Try replacing heating element in hot water heater.

the faucet has a scald proof device. remove the handle and adjust.

Assuming that you have sufficient hot water, you need to adjust the Scald-Guard valve. It's usually quite easy to do. The intent is to limit the amount of hot water that can be fed to to shower head or tub spout. On the 1300/1400 series faucents there is a disk behind the faucet knob/lever called the rotational limit stop. Remove the knob/lever, either by popping the cover off the knob and removing the screw with a Philips head screw driver, or removing the handle with an allen wrench. Next adjust the rotational limit stop disk clockwise to increase the limit on hot water flow. Delta claims each tooth you click past clockwise will increase the maximum water temperature by 6 degrees F.

Delta has a great FAQ on their web site. As of Jan 30, 2011, this link is valid:
http://www.deltafaucet.com/customersupport/faq/Water+Temperature/

If the rotational limit stop disk is already turned to the maximum point (clockwise), then you may have a hot water flow problem (either with the cartridge or to or in the manifold). The cartridges require a little more know-how to replace. You'll need to shut off the main water valve prior to removing the old cartridge. There are a couple of places that detail how to replace and/or service the cartridges, including a short video on youtube. I can post more details on this if you find you need to replace the cartridge.

Remove handle to gain acess to the temperature limit stop. Remove handle and pull out handle adapter kit and next there is a dail that can be adjusted to control the water to balance the temp. It could have been installed wrong, pay attention to where it is now and pull it back to it disengages out of the stem and move it counter clockwise a little and reinstall. Put handle on and test water for correct movement.

Go to link below for a part's diagram if needed.

TO ORDER PARTS CALL: 1-800-465-6130
www.moen.com

There is a round ring with teeth. This can be rotated clockwise or counter clockwise to adjust the tempered water temp. This step will have to be repeted until you get the temp that you want. Should be no more that 105 degrees max.