Table of Contents
TROUBLESHOOTING (C0ntinued)
Symptom
Possible Cause
Furnace (Air
Conditioner)
The location of the thermostat and/
Cycles Too Fast or
or the size of the Heating System
Slow (narrow or
may be influencing the cycle rate
wide temperature
swing)
1.) Heating system is not able to heat
2.) Cooling system is not able to cool
3.) If "--" is displayed for the Room
"Call for Service"
icon appears on
displayed
4.) None of the buttons operate on
5.) If "Call for Service" is flashing,
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.
the space to within 10 degrees of
the setpoint within 2 hours
the space to within 10 degrees of
the setpoint within 2 hours
Temperature, a replacement
thermostat is needed
the thermostat
compressor self diagnostic is
detecting an issue with the
outdoor unit
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)
5.) Contact a service person to verify the
equipment is operating correctly
7
Table of Contents
