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this is an option in the menu to limit settings. See page 8 HERE
Let me know if any questions about it
you can go into the menu with the manual I sent and not use function 4.
Then if the thermostat fails to keep temp the issue is likely not the thermostat but the equipment.
Do you still have the manual I sent?
Is there a program running or are you using manually?
see page 12...to the left of the screen is a tiny hole. The size of a paperclip end. Use a sharp point and insert into that hole and press. That should reset thermostat
just a moment and I will see if someone can place a call. Just a moment