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Have you tried other settings? Try 77 or 80 and see if it cuts off then. If not, suspect a stuck relay on the control board or faulty sensor. I assume you have cleaned the condenser and air filters?
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replace the thermostat
of course it will not stop if the air in the room is not controlled ( doors open , window open, room to big fore the ac unit or if the temp control is set too low ( 25 c is optimum setting)
If this set temp changes on its own then the circuit board has failed. Call a service tech or replace the unit. But this 86° might be the indoor temp, not the set temp? If I set my temp to 75°, then my temp goes to 86°, then the set temp (target temp) is 75° & actual room temp is 86°. The unit may not be working properly. Not sure if this helps.
I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room temperature...it doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)
There should be a limit switch and once the heater reaches the set temperature the blower gets signal from the limit and that turns on the blower. If you are not getting the blower until after the room is up to temp then it is coming on it may be the low limit is bad and it is cooling itself down on the high limit. If you are unsure of this please consult a heating service person, this is a serious problem that a trained service person should deal with. This can lead to a house fire!
Depends on your Tstat. The set point is different from room temp. My tsat show set point and room temp. But to answer you when you set at 72 and room temp is 75 . It will go back to room temp till you reach that temp. Rusty
personally i'd just replace the thermostat, but try pulling the front panel off and look on the circuit board and see if there is a jumper for F/C or any other settings. you may try changing its position. you can also remove the batteries for 15 minutes and see if it resets itself. the only other thing it could be is a wiring issue.
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