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TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display
or causes erratic thermostat operation, reset the thermostat
by pressing the , and TIME buttons simultaneously.
If the thermostat has power, has been reset and still does not
function correctly contact your heating/cooling service person
or place of purchase.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
No Heat
1. System Switch not set to Heat.
2. Loose connection to thermostat or
system
3. Heating System requires service or
thermostat requires replacement.
Set System Switch to Heat and raise setpoint above room
temperature.
Verify thermostat and system wires are securely attached.
Diagnostic: Set System Switch to Heat and raise the
setpoint above room temperature. Within a fi ve minutes
the 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 person to
verify the heating system is operating correctly.
No Cool
1. System Switch not set to Cool.
2. Loose connection to thermostat or
system.
3. Cooling System requires service or
thermostat requires replacement
Set System Switch to Cool and lower setpoint below room
temperature.
Verify thermostat and system wires are securely attached.
Same procedures as diagnostic for No Heat condition
except set the thermostat to Cool and lower the setpoint
below the room temperature. There may be up to a fi ve
minute delay before the thermostat clicks in Cooling if the
compressor lock-out option is selected in the confi guration
menu (Item 6).
Heat, Cool or Fan Runs
Constantly
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in Heat/Cool/Fan
system.
4. Fan Switch set to Fan On.
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
described below. If the condition persists, the manufacturer
of your system or service person can instruct you on how
to test the Heat/Cool/ system for correct operation. If the
system operates correctly, replace the thermostat.
Furnace Cycles Too Fast or
Too Slow
Cooling Cycles Too Fast
or Too Slow
(narrow or wide
temperature swing)
1. The location of the thermostat and/or
the size of the Heating or Cooling
System may be infl uencing the cycle
rate.
Item 3 (CR Heat) or 4 (CR Cool) in the Confi guration
Menu is the adjustment that controls the cycle rate. If an
acceptable cycle rate is not achieved using the FA (Fast)
or SL (Slow) adjustment contact a local service person for
additional suggestions.
Thermostat Setting and
Thermometer Disagree
1. Thermostat thermometer setting
requires adjustment.
The thermometer can be adjusted +/- degrees as listed in
item 8 of the Confi guration Menu. No other adjustment is
possible.
Clock Loses or Gains
Time
1. Loss of power to thermostat. The thermostat will maintain its program in memory even
with no power but the clock time will be incorrect when
power is restored. See No Heat/No Cool /No Fan (common
problems) above for items to check in the system.
Heat or Cool Starts Early
1. EMR activated. See Confi guration Menu (Item 3)
Thermostat Does Not
Follow Program
1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the
clock.
3. Voltage spike or static discharge.
4. See “Heat or Cool Starts Early”
above.
Check current clock and program settings including the AM
or PM designations for each time period. If a voltage spike
or static discharge occurs use the Reset Operation listed
above.
Blank Display and/or
Keypad Not Responding
1. Voltage Spike or Static Discharge. If a voltage spike or static discharge occurs use the Reset
Operation listed above.