Carrier Digial Thermostat registers wrong Temp
 

2 years ago we had a brand new high efficiency furnace / AC unit
installed.
Just recently we noticed that the digital thermostat was registering
the incorrect temp.
It is stating the house is about 5 degrees warmer than the actual temp.
Desides just offsetting the thermostat for the temp - does anyone have
any ideas on how to fix this issue?
Please post to the group.