Honeywell MAGICSTAT 3355 Owner's Manual page 35

The furnace cycles too frequently or
the system cycle length is too short
or too long.
The thermostat's current setting
does not match the display
temperature to within 1 .
Incorrect room temperature showing
on thermostat display.
bAt Lo remains on display after
fresh batteries are installed.
Readjust system on-time according to instructions on
pages 18 and 19.
Check that the wiring hole in the wall behind the wallplate
was plugged with insulation to prevent drafts that might
adversely affect the 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 may differ for up to 30 minutes after
recovery period.
Make sure the hole behind the thermostat is plugged with
insulation to help prevent drafts from adversely affecting
the thermostat operation.
The thermostat is factory-calibrated, and cannot be
adjusted.
Remove the batteries. Wait one hour. Install fresh alkaline
batteries.
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69-1012