White Rodgers 1F86ST-0471 Troubleshooting, Symptom, Possible Cause, Corrective Action

TROUBLESHOOTING

Reset Operation

Note: When thermostat is reset, installer confi guration menu settings and programming will reset to factory settings.

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermo- stat by removing the wires from terminals R and C (do not short them together) and removing batteries for 2 minutes. After resetting the thermostat, replace the wires and batteries. If the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.

Note: Be sure to review the installer confi guration menu settings.

To reset the programming, clock and confi guration settings, press and and the VENT button simultaneously. The thermostat should go blank and then all segments will be displayed momentarily.

Symptom	Possible Cause		Corrective Action
No Heat/No Cool/No	1.	Blown fuse or tripped circuit breaker.	Replace fuse or reset breaker.
Fan (common	2.	Furnace power switch to OFF.	Turn switch to ON.
problems)	3.	Furnace blower compartment door or	Replace door panel in proper position to engage safety interlock
		panel loose or not properly installed.	or door switch.
	4.	Loose connection to thermostat or system.	Tighten connections.
No Heat	1.	Pilot light not lit.	Re-light pilot.
	2.	Furnace Lock-Out Condition. Heat	Many furnaces have safety devices that shut down when a lock-
		may also be intermittent.	out condition occurs. If the heat works intermittently contact the
			furnace manufacturer or local HVAC service person for assis-
	3.	Heating system requires service or	tance.
			Diagnostic: Set SISTEMA Switch to Calor and raise the set-
		thermostat requires replacement.	point above room temperature. Within a few seconds the thermo-
			stat should make a soft click sound. This sound usually indicates
			the thermostat is operating properly. If the thermostat does not
			click, try the reset operation listed above. 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, contact the furnace manufacturer or a HVAC
			service person to verify the heating is operating correctly.
No Cool	1.	Cooling system requires service or	Same as diagnostic for No Heat condition except set the thermo-
		thermostat requires replacement.	stat to Frio and lower the setpoint below the room temperature.
			There may be up to a fi ve minute delay before the thermostat
			clicks in Cooling.
Heat, Cool or Fan	1.	Possible short in wiring.	Check each wire connection to verify they are not shorted or
Runs Constantly	2.	Possible short in thermostat.	touching together. No bare wire should stick out from under ter-
	3.	Possible short in heat/cool/fan system.	minal block. Try resetting the thermostat as described above. If
	4.	VENT Switch set to VENT ON.	the condition persists the manufacturer of your system or service
			person can instruct you on how to test the Heat/Cool system for
			correct operation. If the system operates correctly, replace the
			thermostat.
Thermostat Setting &	1.	Thermostat thermometer setting	The thermometer can be adjusted +/- 4 degrees. See Tempera-
ThermostatThermometer		requires adjustment.	ture Display Adjustment in the Confi guration Menu section.
Disagree
Furnace	1.	The location of the thermostat and/or	Digital thermostats provide precise control and cycle
(Air Conditioner)		the size of the Heating System may	faster than older mechanical models. The system turns
Cycles Too Fast or Too		be infl uencing the cycle rate.	on and off more frequently but runs for a shorter time so
Slow (narrow or wide			there is no increase in energy use. If you would like an in-
temperature swing)			creased cycle time, choose bA for slow cycle in the Con-
			fi guration menu, step 6 (heat), 7 (cool) or 8 (heat pump).
			If an acceptable cycle rate is not achieved, contact a local
			service person for additional suggestions.

White-Rodgers is a division of Emerson Electric Co.

The Emerson logo is a trademark and service mark of Emerson Electric Co.

HOMEOWNER HELP LINE: 1-800-284-2925

St. Louis, Missouri

www.white-rodgers.com