Hello, We have had a Carrier Heat Pump with a Honeywell thermostate for over 5 years without a problem. Not sure what model number the T-stat is. When I came home Friday, it said te indoor temp was 92, yet it was very cold, mid 70's inside. I assumed the sensor went bad. We've wanted a programable unit, so we bought a Honeywell RTH7500 and installed it. This unit is also reading in the 90's for an indoor temp.
The T-Stat is mounted on an exterior wall, but a laser temp finder shows the wall to be 80 degrees and the T-State is 78 degrees. Any ideas on why the original unit, and the new unit are showing and indoor temp nearly 10 degrees higher than it should be?
Thanks, Doug