9
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 five 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 manufac-
turer 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 condi-
tion 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 compressor lock-out option is selected in
the configuration 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 influencing the
cycle rate.
Item 4 (CR Heat) or 5 (CR Cool) in the Configuration
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 ad/-4 degrees as
listed in item 8 of the Configuration 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 Configuration 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.
Summary of Contents for 1F87-0261
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