TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display
or causes erratic thermostat operation, you may need to
in Cool or Heat
Symptom
No Heat
No Cool
Heat, Cool or Fan Runs
Constantly
Furnace Cycles Too Fast
or Too Slow Cooling
Cycles Too Fast or Too
Slow (narrow or wide
temperature swing)
Thermostat Setting and
Thermometer Disagree
Blank Display and/or
Keypad Not Responding
and
Possible Cause
2. Furnace power switch to OFF.
panel loose or not properly installed.
2. Loos connection to thermostat or
system
thermostat requires replacement.
2. Loose connection to thermostat or
system.
thermostat requires replacement
system.
rate.
the thermostat has power, has been reset and still does not
buttons
or place of purchase.
Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
temperature.
tached.
thermostat should make a soft slick sound. This sound
usually indicates the thermostat is operating properly.
If the thermostat does not click, try the reset operation
listed above. If the thermostat does not click after being
reset contact your heating and cooling service person
or place of purchase for a replacement. If the thermostat
clicks, contact the furnace manufacturer or a service per
son to verify the heating system is operating correctly.
room temperature.
tached.
except set the thermostat to Cool and lower the setpoint
below the room temperature. There may be up to a five
minute delay before the thermostat clicks in Cooling if the
Check each wire connection to verify they are not shorted
or touching together. No bare wire should stick out from
under terminal screws. Try resetting the thermostat as de
scribed below. If the condition persists, the manufacturer
of your system or service person can instruct you on how
system operates correctly, replace the thermostat.
for additional suggestions.
possible.
If a voltage spike or static discharge occurs use the Reset
Operation listed above.