Emerson 1F86-0244 User Manual

7
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display
or causes erratic thermostat operation, you may need to
reset the thermostat. To reset, the System Switch must be
in Cool or Heat.Simultaneouslypress and buttons
for approximately 10 seconds until thedisplaygoesblank.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
commonproblems)
1.Blownfuseortrippedcircuitbreaker.
2. Furnace power switch to OFF.
3.Furnaceblowercompartmentdooror
panel loose or not properly installed.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
No Heat
1.SystemSwitchnotsettoHeat.
2. Loos connection to thermostat or
system
3.HeatingSystemrequiresserviceor
thermostat requires replacement.
SetSystemSwitchtoHeatandraisesetpointaboveroom
temperature.
Verifythermostatandsystemwiresaresecurelyat-
tached.
Diagnostic:SetSystemSwitchtoHeatandraisetheset-
pointaboveroomtemperature.Withinaveminutesthe
thermostat should make a soft slick 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 service per-
son to verify the heating system is operating correctly.
No Cool
1.SystemSwitchnotsettoCool.
2. Loose connection to thermostat or
system.
3.CoolingSystemrequiresserviceor
thermostat requires replacement
SetSystemSwitchtoCoolandlowersetpointbelow
room temperature.
Verifythermostatandsystemwiresaresecurelyat-
tached.
SameproceduresasdiagnosticforNoHeat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 if the
compressorlock-outoptionisselectedinthecongura-
tionmenu(Item5).
Heat, Cool or Fan Runs
Constantly
1.Possibleshortinwiring.
2.Possibleshortinthermostat.
3.PossibleshortinHeat/Cool/Fan
system.
4.FanSwitchsettoFanOn.
Check each wire connection to verify they are not shorted
or touching together. No bare wire should stick out from
under terminal screws. Try resetting the thermostat as de-
scribed below. 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.
Furnace Cycles Too Fast
or Too Slow Cooling
Cycles Too Fast or Too
Slow (narrow or wide
temperature swing)
1.Thelocationofthethermostatand/or
thesizeoftheHeatingorCooling
Systemmaybeinuencingthecycle
rate.
Item3(CRHeat)or4(CRCool)intheConguration
Menuistheadjustmentthatcontrolsthecyclerate.Ifan
acceptablecyclerateisnotachievedusingtheFA(Fast)
orSL(Slow)adjustmentcontactalocalserviceperson
for additional suggestions.
Thermostat Setting and
Thermometer Disagree
1.Thermostatthermometersetting
requiresadjustment.
Thethermometercanbeadjusted+/-degreesaslistedin
item7oftheCongurationMenu.Nootheradjustmentis
possible.
Blank Display and/or
Keypad Not Responding
1.VoltageSpikeorStaticDischarge. If a voltage spike or static discharge occurs use the Reset
Operation listed above.

Emerson 1F86-0244 Specifications

General

Display Type	Digital
Stages	1 Heat/1 Cool
Backlight	Yes
Mounting	Wall
Compatibility	gas, oil, electric systems
Voltage	24 VAC
Temperature Range	45°F to 90°F
Programmable	Non-programmable
Power Source	Battery or Hardwired