Symptom
Remedy
No display
Check for 24 VAC at thermostat; display is blank when 24 VAC is not present
System fan does not come on properly
Verify wiring is correct
All thermostat buttons are inoperative
Verify 24 VAC is present; unit locks out when 24 VAC is not present
Program schedule activates at the
wrong time
Check time (AM/PM) set on thermostat (see “Setting the Time,” Page 23)
Thermostat turns on and off too
frequently
Adjust temperature differential (See “Setting a New Temperature
Differential,” Page 17)
Thermostat does not follow program
Verify it is operating in Program mode (PROG displays solid); check time
(AM/PM); check if in Hold mode (PROG flashes in Hold mode)
“PROGram” flashes (in Hold mode)
Press Hold button to remove from Hold mode
Fan runs continuously
Check Fan On/Auto switch; fan runs continuously when fan switch is in ON
position
Room temperature is not correct
Verify wall hole for wires is plugged with putty or insulation
Problem not listed above
Press Reset button once*
* Reset Button Function
Time, day and mode changed to last saved settings (saved after power loss or when exiting
program setup); configuration and program settings are unchanged.
Troubleshooting
