Emerson 1F97-1277 Troubleshooting, Symptom Possible Cause Corrective Action, Reset Operation

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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..

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..

 

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

 

 

may also be intermittent..

when 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 SYSTEM Switch to HEAT and

 

 

thermostat requires replacement..

raise the setpoint above room temperature.. Within

 

 

 

a few seconds the thermostat should make a soft

 

 

 

click sound.. This sound usually indicates the ther-

 

 

 

mostat 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

 

 

thermostat requires replacement..

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

1.

Possible short in wiring..

Check each wire connection to verify they are not

Runs Constantly

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 block.. 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..

Thermostat Setting &

1.

Thermostat thermometer setting

The thermometer can be adjusted +/- 4 degrees..

Thermostat Thermometer

 

requires adjustment..

See Temperature Display Adjustment in the Con-

Disagree

 

 

figuration Menu section.

Furnace (Air Conditioner)

1.

The location of the thermostat and/or

Digital thermostats provide precise control and

Cycles Too Fast or Too Slow

 

the size of the Heating System may

cycle faster than older mechanical models.. The

(narrow or wide

 

be influencing the cycle rate.

system turns on and off more frequently but runs for

temperature swing)

 

 

a shorter time so there is no increase in energy use..

 

 

 

If you would like an increased cycle time, choose

 

 

 

SL for slow cycle in the Configuration menu, step 7

 

 

 

(heat) or 8 (cool).. If an acceptable cycle rate is not

 

 

 

achieved, contact a local HVAC service person for

 

 

 

additional suggestions..

Forgot Keypad

 

 

Press the menu button (button will disappear) and

Lockout Code

 

 

hold in for 20 seconds.. This unlocks the thermostat..

First item in Configuration

 

 

Earlier model of thermostat refer to 37-6814D..

Menu is not SS1 or HP1

 

 

 

 

 

 

 

White-Rodgers is a business of Emerson Electric Co.

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

www.white-rodgers.com www.emersonclimate.com

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Contents Installation and Operating Instructions for Model ApplicationsSave these instructions for future use IndexInstallation Wiring ConnectionsInstalling New Thermostat Battery LocationSingle Stage Connections Single Stage System with Single TransformerSingle Stage with Two Transformers Heat Pump SystemsProgramming and Configuration Items Displays and Keypad Lockout when in keypad lockout modeThermostat Quick Reference Home Screen DescriptionINSTALLER/CONFIGURATION Menu Configuration MenuMode Fast rate SelectionsHeat Cool Emer Keys to select on Press Display will readRecord the number you select for future use LoweredOperating Your Thermostat ProgrammingEnter the Heating Program Enter the Cooling ProgramAutomatic Schedule Entering Fan ProgramEnergy Saving Factory Pre-Program Planning Your Program ImportantWorksheet for Re-Programming 5+1+1 and 7 Day Program Wired Remote Temperature Sensing Weight of Remote ReadingTroubleshooting Symptom Possible Cause Corrective ActionReset Operation

1F97-1277 specifications

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