20
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, check Gas/Electric switch position
All thermostat buttons are inoperative Verify 24 VAC is present; unit locks out when 24 VAC is not present
No response with first button press First button press activates backlight only
Program schedule activates at the wrong
time
Check time (AM/PM) set on thermostat (see “Setting the Time,” Page 14)
Thermostat turns on and off too frequently Adjust temperature differential (see “Configuration Mode Setting 2,” Page 8)
Thermostat does not follow program Verify it is operating in program mode (PROG displays); check time (AM/PM);
check if in 2 hour program override
Fan runs continuously Check Fan On/Auto switch, fan runs continuously in On position
Status indicator light not on during call Turn status indicator function on
(see “Configuration Mode Setting 10,” Page 10)
Room temperature is not correct Verify wall hole for wires is plugged with putty or insulation, calibrate thermostat
(see “Configuration Mode Setting 8,” Page 10).
If remote sensor is used, check S1 and S2 terminal connections
LOC displays when any button is pressed Thermostat has the button lockout function activated (see “Lockout Function,”
Page 17)
– – on display instead of room temperature Check for a bad connection at S1 and S2 terminals, if used
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
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