11
TR
TR
TR
TR
TROUBLESHOO
OUBLESHOO
OUBLESHOO
OUBLESHOO
OUBLESHOOTING
TING
TING
TING
TING
Symptom
No Cool
Heat, Cool or Fan
Runs Constantly
Furnace
(Air Conditioner)
Cycles Too Fast
or Too Slow (narrow or
wide temperature swing)
Thermostat Setting &
Thermostat Thermometer
Disagree
Blank Display and/or
Keypad Not Responding
Heat Setpoint will
not Respond to the
Temperature Up Key
Cool Setpoint will
not Respond to the
Temperature Down Key
Forgot Keypad
Lockout Code
Why won’t my 2nd or
3rd stage come on?
Possible Cause
1. SYSTEM button not pressed to
COOL
.
2. Loose connection to thermostat or
system.
3. Cooling system requires service or
thermostat requires replacement.
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.
1. The location of the thermostat and/or
the size of the Heating System may
be influencing the cycle rate.
1. Thermostat thermometer setting
requires adjustment.
1. Voltage spike or static discharge.
1. The desired setpoint conflicts with the
setpoint of the
COOL
mode.
1. The desired setpoint conflicts with the
setpoint of the
HEAT
mode.
First stage is keeping up with demand.
Corrective Action
Press SYSTEM button to
COOL
and lower setpoint
below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure 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.
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.
Digital thermostats normally provide precise
temperature control and may cycle faster than some
older mechanical models. A faster cycle rate means
the unit turns on and off more frequently but runs for
a shorter time so there is no increase in energy use.
If you would like to increase the cycle time, choose
SL
for slow cycle in the menu, step 4. If an accept-
able cycle rate is not achieved as received or by
choosing slow cycle, contact a local service person
for additional suggestions.
The thermometer can be ad/- 4 degrees.
See Temperature Display Adjustment in the
Configuration Menu section.
Use the Reset Operation at top of previous page.
Change system mode to
COOL
. Raise the Cool
setpoint. Return to
HEAT
mode and set desired
temperature.
Change system mode to
HEAT
. Lower the Heat
setpoint. Return to
COOL
mode and set desired
temperature.
CAUTION: This resets the thermostat to factory
default settings of the configuration menu. After
performing this reset, the thermostat will require
configuration again. Be sure that you know the
required configuration settings before resetting.
With the thermostat in any mode, press
and
at
the same time to enter the configuration menu at the
point where the lockout code is to be entered. Press
and
and SYSTEM button at the same time to
reset the lockout code, unlock the keypad and reset
all configuration menu settings.
Your thermostat is designed to determine the optimum
time to activate the second stage. Simply raising the
temperature in heating or lowering it in cooling will not
always force the thermostat to bring the second stage
on quickly. There is a time delay from 0-30 minutes
depending on the performance of the first stage of the
system.