change of clean your air filter. The factory set interval for CHNG FLTR
to be displayed is 200 hours of fan operation. This can be set anywhere from 0 to 1975 hours in 25 hour increments. A selection of OFF will
cancel this feature. When CHNG FLTR is displayed, you can clear it by
pressing the SERVICE button. This resets the timer and starts counting the hours until the next filter change. The following steps will allow you to change the number of hours for filter
1.If you see CHNG FLTR on the display, press the SERVICE button
once to reset the timer. If you do not see CHNG FLTR proceed to step 2.
When the SERVICE button is pressed twice, the display will show the number of hours remaining before CHNG FLTR indicator will display.
2.Press the SERVICE button. The display will show SET FILTER TIME
and will show the number of hours to filter change.
3.Press TIME FWD or TIME BACK
to change the time to your requirements.
4.Press PROGRAM RUN to return to the normal operating mode. NOTE: If unsure what interval to use between filter changes or cleaning, contact the manufacturer of your heating/cooling equipment.
UV Bulb Replacement Indicator.
This feature allows the thermostat to display the words CALL SERV UV
(Call for Service of UV bulb) after a set time of UV bulb operation. This is a reminder to maintain your UV system at optimum level of operation. When
enabled the factory set interval for CALL SERV UV to be displayed is
350 days of UV bulb operation and can be adjusted in 25 day increments. This should be adjusted with respect to
the bulb’s recommended maintenance schedule.
Routine Maintenance Reminder.
This feature allows the thermostat to display the words CALL SERV (Call for Service) after a set time of system operation. This is a reminder to maintain your system at optimum
level of operation. The factory set interval for CALL SERV to be
displayed is days of system operation. This should be adjusted with respect to your HVAC service company’s recommendation. When enabled the default is 175 days and can be adjusted in 25 day increments.
System and
Thermostat Diagnostics. The display will indicate CHECK SYSTEM if the room temperature
does not rise within two hours of the
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