21
Symptom Remedy
No display Check for 24 VAC/VDC at thermostat; display is blank when 24 VAC/VDC is
not present
System fan does not come on properly Verify wiring is correct, check electric heat setup in configuration (see
“Configuration Mode,” Page 7)
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 “Differential,” Configuration Mode Setting 4, Page 8)
Thermostat does not follow program Verify it is operating in Program mode (PROG displays); check time (AM/PM)
Fan runs continuously Check fan On/Auto switch; check programmable fan setting in program;
check fan settings in configuration (see “Configuration Mode” Pages 7-10)
Room temperature is not correct Verify wall hole is plugged with putty or insulation; check wiring and location
for remote sensor if used
LOC displays when any button is
pressed or thermostat buttons are
inoperative
Thermostat has the button lockout function activated (see “Lockout
Feature,” Page 17)
Very limited setpoint adjustment Thermostat has the button lockout function activated (see “Lockout
Feature,” Page 17)
Check configuration mode settings, Pages 7-10
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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