Emerson 1F73 installation instructions Troubleshooting, Symptom Possible Cause Corrective Action

7 OPERATION

CONTINUED FROM PAGE 5

Automatic System Changeover

When the thermostat is in the AUTO mode, both the Flame and Snowflake icons are displayed. The thermostat will call for heat or cool depending on the room temperature. The setpoint tem- perature displayed will be that of the last mode called. If the last

system cycle was heat, the HEAT setpoint will be displayed. If the room temperature raises above the HEAT setpoint and the COOL setpoint and a call for cool is required, the temperature displayed will change to be the COOL setpoint.

8 TROUBLESHOOTING

Reset Operation

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by removing power from R terminal. If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.

Symptom	Possible Cause		Corrective 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
		panel loose or not properly installed.	safety interlock or door switch.
No Heat	1. Pilot light not lit.		Re-light pilot.
	2.	System Switch not set to HEAT.	Set System Switch to HEAT and raise setpoint
			above room temperature.
	3.	Loose connection to thermostat or system.	Verify thermostat and system wires are securely
			attached.
	4.	Furnace Lock-Out Condition. Heat may also	Many furnaces have safety devices that shut
		be intermittent.	down when a lock-out condition occurs. If the
			heat works intermittently contact the furnace
			manufacturer or local service person for
			assistance.
	5.	Heating system requires service or	Diagonistic: Set System Switch to HEAT and raise
		thermostat requires replacement.	the setpoint above room temperature. Within a few
			seconds the thermostat should make a soft click
			sound. This sound usually indicates the thermo-
			stat 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
			service person to verify the heating is operating
			correctly.
No Cool	1. System Switch not set to COOL.		Set System Switch to COOL and lower setpoint
			below room temperature.
	2. Loose connection to thermostat or system.		Verify thermostat and system wires are securely
			attached.
	3.	Cooling system requires service or	Same procedure as diagnostic for No Heat
		thermostat requires replacement.	condition except set the thermostat to COOL and
			lower the setpoint below the room temperature.
			There may be up to a five minute delay before the
			thermostat clicks in Cooling.
Heat, Cool or Fan Runs Constantly.	1. Possible short in wiring.		Check each wire connection to verify they are not
	2.	Possible short in thermostat.	shorted or touching together. No bare wire should
	3.	Possible short in heat/cool/fan system.	stick out from under terminal screws. Try resetting
	4.	Fan Switch set to Fan On.	the thermostat as 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.

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