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TROUBLESHOOTING (C0ntinued)
Symptom
Furnace (Air
Conditioner)
Cycles Too Fast or
Slow (narrow or
wide temperature
swing)
"Call for Service"
icon appears on
displayed
Resetting the Thermostat or Thermostat Settings
If the thermostat has good batteries, but has a blank display or does not respond to key
presses, the thermostat should be reset by removing the batteries for 2 minutes. This reset
will not change the menu settings. If the condition persists after reinstalling the batteries,
replace the thermostat.
To conveniently reset only the user settings back to factory defaults, press the temperature
and
buttons and move the system switch from OFF to HEAT at the same time and hold until
the display goes blank and resets.
WARNING: This product contains a chemical known to the state of California to cause
cancer and birth defects and other reproductive harm.
Possible Cause
The location of the thermostat
and/or the size of the Heating
System may be influencing the
cycle rate
1.) Heating system is not able
to heat the space to within
10 degrees of the setpoint
within 2 hours
2.) Cooling system is not able
to cool the space to within
10 degrees of the setpoint
within 2 hours
3.) If "--" is displayed for the
Room Temperature, a
replacement thermostat is
needed
4.) None of the buttons operate
on the thermostat
Corrective Action
Digital thermostats provide precise control and cycle
faster than older mechanical models. The system
turns on and off more frequently but runs for a shorter
time. If you would like to increase cycle time, choose
SLO for slow cycle in the Installer menu. (Reference
menu items 30 & 35) If an acceptable cycle rate is not
achieved, contact your HVAC service person.
1.) See corrective action for "No Heat"
2.) See corrective action for "No Cool"
3.) Replace thermostat
4.) Make sure keypad lockout is not turned on
(denoted by icon)
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