White Rodgers 1F95-391 FAQs, Troubleshooting, Symptom, Possible Cause, Corrective Action

TROUBLESHOOTING
Symptom	Possible Cause		Corrective Action
Thermostat Setting and Thermostat	1.	Thermostat thermometer setting requires	The thermometer can be adjusted +/- 5 degrees.
Thermometer Disagree		adjustment.	See Temperature Display Adjustment in the
			Operating Manual under Configuration.
Thermostat Display Shows CHCK PAD,	1.	Thermostat service indicators.	These indicators can be reset or modified in the
CHNG FLTR, CALL SERV UV, CALL SERV			service button menu (see pg. 8).

FAQs

Why does the system run with the	Aux. = Auxiliary Heat or the second stage of heat in the Heat mode. This is energized
setpoint and room temperature the	In cooling, as the room temperature falls you will eventually reach the setpoint
same?
	temperature. The system will continue to run until it reaches the low side of the
	temperature setting. As an example: If set to 78 degrees with the room temperature
	falling the thermostat will continue to call for cool as the temperature decreases in the
	following manner. 78.9, 78.8, 78.7, 78.6, 78.5, 78.4, 78.3, 78.2, at approximately 78.2
	the thermostat will quit calling for cool. This is why it is not unusual for the room
	temperature and set temperature to read the same but the system continues to run.
	The amount of time it takes for the system to shut off is dependent on system sizing,
	thermostat location, etc. Note: The thermostat display only displays whole numbers.
	Internally the thermostat calculates decimals.
	In heating as the room temperature increases the system will continue to run until the
	thermostat reaches the high side of the temperature setpoint.
Why is the temperature change	Digitals are engineered to a specific response rate. Compared to a thermometer it will
display so slow?	seem slow. When left to acclimate and control temperature it will provide precise
	temperature control on a properly sized system.
How do I temporarily Override the	Any time your program is running and you would like to override it for a specific
program and Hold Til Timing?	amount of time, press	or	until the temperature you want is displayed. The
	display will indicate HOLD, and the number of hours remaining in the hold period will
	be indicated with the word HRS. To adjust the length of time for the override, press
	TIME FWD or TIME BACK. The time you select will become the new number of hours
	for the Hold Til timing. Once your time is selected, let the thermostat revert back to
	normal operation on its own to accept the change.
What is the thermostat Click Test?	Many furnaces have safety devices that shut the system down when a lock-out
	condition occurs in the furnace. If the thermostat is turned off or the call for heat is
	cancelled (by lowering and then raising the set temperature) the furnace may start
	operating again. A diagnostic to see if the thermostat is operating when the room
	temperature is below the thermostat setting (in heat) is to lower the setting below the
	room temp. Within about 3 seconds the thermostat should make a soft click sound.
	This sound is the thermostat turning off the call for heat and usually indicates the
	thermostat is operating properly. If the thermostat does not click you would be
	suspicious of the thermostat and try resetting it by following it’s reset operation. If the
	thermostat does not click after being reset contact your heating and cooling service
	person or place of purchase for a replacement. If the thermostat clicks and the heat
	works intermittently contact the furnace manufacturer or local service person. They
	will want to observe the condition when it is not working.
	You can raise and lower the temperature a few degrees above and below the room
	temperature and each time expect to hear the thermostat click on and off within a few
	seconds. If it clicks, it is operating properly.

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