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If it's a furnace then flame sensor might be bad .if it's a electric heat then your limit might be shutting it off .If electric then check for fan operation .
Any thermostat, it's calibrating to cut off at the end of 2nd beginning and cut in 2nd ending of temp.<br />
Ex: In heat mode, If you set @ 68 degree, it will cut off 70 degree beginning and cut in at the end of 66 degree. <br />In cool mode, if you set at 68 C degree it will cut off at the end of 66 and cut in will be at the beginning of 70 degree.<br /><br />
From the owners manual:
TEMP Buttons:
Sets the desired temperature.
In COOL or DRY mode, the temperature needs to be set lower than
the current room temperature. In HEAT mode, the temperature needs
to be set higher than the current room temperature.
Otherwise, corresponding operation mode may not start.
Temperature setting range
AUTO/COOL/DRY 18-30 °C
HEAT 16-30 °C
I'm willing to bet a relay burned up. You likely have your tstat set to auto changeover, meaning it automatically goes from heat to cool to maintain desired set points??
Normal settings 70 heating 74 to 76 cooling, I try to leave my cooling a 76 and keep it there. 76 degrees feels good if its 95 or hotter out side and the lower you set it the more it will cost.
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!
Is the thermostat set up for automatic change over from heat to cool? If so, the heat is probably set for 75, you will need to lower the heat setting in order to Lower the cooling. the stat won't let these settings with in 2 degrees of each other so the heating and cooling don't fight each other.
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