Adjusting the temperature on a Titan water heater is simple, however, there is one very important thing that you need to do first.

Make sure you open a hot water faucet and leave it running before you press the red or blue buttons on the control panel.

The red and blue buttons on the front of a Titan water heater only respond if the heater's flow switch is active. In order for that to be true, water has to be flowing through it.