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Troubleshooting
Reset Operation
If a voltage spike or static discharge blanks out the display
or causes erratic thermostat operation, you may need to
reset the thermostat. To reset, the System Switch must be
in Cool or Heat. Simultaneously press and buttons
for approximately 10 seconds until the display goes blank. 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.
1. Replace fuse or reset breaker.
2. Turn switch to ON.
3. 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.
1. Set System Switch to Heat and raise setpoint above
room temperature.
2. Verify thermostat and system wires are securely
attached.
3. Diagnostic: Set System Switch to Heat and raise
the setpoint above room temperature. Within a five
minutes the thermostat should make a soft click
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
1. Set System Switch to Cool and lower setpoint below
room temperature.
2. Verify thermostat and system wires are securely
attached.
3. 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 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 above. 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 adjusted +/- degrees as listed in
item 8 of the Configuration Menu (see page 5). No other
adjustment is possible.
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.