Honeywell Electronic Programmable Thermostat Owner's Manual page 15

Thermostat current
temperature setting does not
match the display temperature
to within 1 .
Incorrect temperature
showing on thermostat display.
bAt Lo remains on display after
fresh batteries are installed.
Check that the wiring hole in the wall behind the
wallplate was plugged with insulation to prevent
drafts that might adversely affect thermostat operation.
Be aware that it is normal for the current setting and
display temperature to differ on occasion.
During recovery from setback or setup, setting and
display temperatures can differ for up to 30 minutes after
the recovery period.
The thermostat is factory-calibrated and cannot be
adjusted.
Remove the batteries. Wait one hour. Install fresh
alkaline batteries.
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