Thermometer Adjustment
The thermometer was accurately calibrated at
the factory and should only need adjustment if it
was dropped or mishandled.
If the setpoint lever and the thermometer
reading do not agree, use the following procedure:
1. Remove thermostat cover and open the
flip-up cover.
2. Set the thermostat cover on a table near a
thermometer of known accuracy.
3. Allow at least five minutes for cover
thermometer to sense area temperature, then
compare the readings. Be careful not to touch
thermometer or breathe on it.
4. If the readings are the same, replace the
cover and put the system into operation.
5. If the readings are different, insert a small
screwdriver in the thermometer slot, see Fig. 7,
and turn it until both thermometers read the
same.
6. Replace the thermostat cover and put the
system into operation.
Fig. 7—Thermometer Adjustment.
INSERT AND TURN
SCREWDRIVER
BACKSIDE OF
FLIP-UP COVER
THERMOMETER
SLOT
M1810
If you have questions regarding the installation and programming of your Honeywell thermostat,
please contact the Honeywell Customer Assistance Center at 1-800-468-1502, Monday-Friday, 7:30 a.m.
to 4:00 p.m., Central time. Before you call, please have the following information available: make and
model of furnace, old thermostat, and air conditioner.
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25 69-0639—1