This is set up in a cabin which I am at only 10 days at a time, every few months. When I get there. I push button D on my key pad link. The button lights up and enables the following programs to run:
1. turns thermastat terms to desired temperature
2. turns hot water circulator on.
3. turns instant hot water on
4. sets new lighting schedule for cabin at night.
When I leave the cabin 10 days later I push the D button again and the button light turns off and it disables the above programs from running. The problem is that I forget to hit the D button when I leave sometimes. and then the programs continue to run. there is no danger in them running other than it costs a lot in electricity. There is no harm in it turning off earlier than 10 days if I leave earlier. I would like it to turn off 240 hours (or days) after the D button is pushed which would coincide with my departure 99% of the time. If the D button is on, and there is a power failure, I am not sure if the D button is reset to on or off when the power comes back on, It has never happened. I would assume that when the power came back on the D button would still be on. If so, can the timer just continue from where it left off? If not probably the best thing would just be to have it turn off the D button on rebooting.
Hope this info helps