Heat pump is in heat mode 4 hrs. in to the

It takes about 4-5 minutes to change over from cooling mode to heat.

Probly need a nu thermostat or the batterybad

check the timer.

Check your thermostat setting. It must be minimum 4 degrees difference from room temp.

If your unit is cooling and heating ok make sure the mode your on is not an automatic mode as this makes the unit change between heating and cooling to maintain set temp select either cooling only mode or heating only mode this means once set temp is reached unit will stop until it notices a rise or drop in temp and will come on again in your set mode

so its obviously an air con? are you running in automatic mode, if so that can be a problem as automatic yes is a good idea to maintain a set temp but it goes from heating to cooling so you heat an area and t/stat says its too warm turns heating off then goes over set temp so its starts cooling usually that is to do with the location of t/stat and set out of heater but automatic is useless and really is only good for offices where its not noticed like your own home, i tell people not to use automatic but set the control to what you want so if its cold you heat if its hot you cool you don't need both tassie where i'm from has four seasons in one day but i still don't think you need to heat and cool in one day the only place in the world that has such major condition changes is the sahara desert where it'l cook you during the day and freeze you of a night so if my assumptions right and you are using auto function DON'T. use what you need to either cool or heat your house not both in the same day it doesn't make sense and yes you can run it all year long on auto but its really not worth paying to run something you don't really need!

Hello NTRINHVU You have to hit the HOLD button to keep 75 permantaly,otherwise it will go back to 85 every 3 hrs automatically.

Red wire goes to Rc with a jumper wire to Rh
White wire goes to W
Green wire goes to G
Yellow wire goes to Y

With an outside temp of 70 your probally getting down to the 40's at night wich is to cool to get much heat rise and with 30,000 gal this will take a few days to raise the temp much also you should have a cover for a pool that big. If you have any wind the pool will loose 90 persent of it's heat from the surface. Once it is warm the heat pump will keep it warm for cheap if it is covered and you run it in the day.

Just delete your current program and "add" a need one. In this field, it allows you to set the hours of operation you wish.