Aquatop D1HT Digital Nano heater 50 watts

[jan4scuba]

Hi
I just installed 2 of these in my twin Nanos. I'm trying to lower the temperature to 77 F from 80F
Every time I try to cycle through the preset settings the temp goes up.

Does anyone have one of these and if so can you tell me how to lower the preset temp to hold steady at 77?

Thanks for any assistance you can provide.

Regards
Jan