White Rodgers 1F85ST-0422 specifications Troubleshooting, Symptom Possible Cause Correction Action

TROUBLESHOOTING

Reset Operation

Note: When thermostat is reset, installer configuration 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 thermostat 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 configuration menu settings.

To reset the programming, clock and configuration settings,

press and and the VENT button simultaneously. The thermostat should go blank and then all segments will be displayed momentarily.

Symptom	Possible Cause		Correction Action
No Heat/No Cool/No Fan	1.	Blown fuse or tripped circuit breaker.	Replace fuse or reset breaker.
(common problems)	2.	Furnace power switch to OFF.	Turn switch to ON.
	3.	Furnace blower compartment door or	Replace door panel in proper position to engage safety
		panel loose or not properly installed.	interlock or door switch.
	4.	Loose connection to thermostat or	Tighten connections.
		system.
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
		may also be intermittent.	a lock-out condition occurs. If the heat works intermittently
			contact the furnace manufacturer or local HVAC service
			person for assistance.
	3.	Heating system requires service or	Diagnostic: Set SISTEMA Switch to CALOR and raise the
		thermostat requires replacement.	setpoint above room temperature. Within a few seconds
			the thermostat 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
		thermostat requires replacement.	thermostat to FRIO and lower the setpoint below the room
			temperature. There may be up to a five minute delay before
			the thermostat clicks in Cooling.
	1.	Possible short in wiring.	Check each wire connection to verify they are not shorted
Heat, Cool or Fan	2.	Possible short in thermostat.	or touching together. No bare wire should stick out from
Runs Constantly	3.	Possible short in heat/cool/vent system.	under terminal block. Try resetting the thermostat as
	4.	VENT Switch set to Fan ON.	described above. If 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
Thermostat Thermometer		requires adjustment.	Temperature Display Adjustment in the Configuration Menu
Disagree			section.
Furnace (Air Conditioner)	1.	The location of the thermostat and/or	Digital thermostats provide precise control and cycle faster
Cycles Too Fast or Too		the size of the Heating System may	than older mechanical models. The system turns on and
Slow (narrow or wide		be influencing the cycle rate.	off more frequently but runs for a shorter time so there is
temperature swing)			no increase in energy use. If you would like an increased
			cycle time, choose bA for slow cycle in the Configuration
			menu, step 6 (Calor), 7 (Frio) or 8 (Bomba de Calor). If an
			acceptable cycle rate is not achieved, contact a local HVAC
			service person for additional suggestions.

	HOMEOWNER HELP LINE: 1-800-284-2925
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