Hayward Heater

[Kev]

I have a Hayward H Series heater at the hotel I work at. It has worked good until this summer I turned it down and now I can't get it to increase the temperature. The up button will not work the down button works. Also the mode button dose not work. I was wondering if there is a way to reset the heater that might make the up and mode button work. I did shut off the main power for a bit then turned it back on but that did not help.