Symptom
Remedy
No.display
Check.for.24.VAC.at.thermostat;.display.is.blank.when.24.VAC.is.not.present
System.fan.does.not.come.on.properly
Verify.wiring.is.correct,.check.electric.heat.setup.in.configuration.(see.
“Configuration.Mode,”.Step.3,.Page.19)
Program.schedule.activates.at.the.
wrong.time
Check.time.(AM/PM).set.on.thermostat.(see.“Setting.the.Time,”.Page.26)
Thermostat.turns.on.and.off.too.
frequently
Adjust.temperature.differential.(see.“Differential,”.Steps.5.and.6,.Page.20)
Thermostat.does.not.follow.program
Verify.it.is.operating.in.Program.mode.(PROG.displays);.check.time.(AM/PM)
Fan.runs.continuously
Check.fan.On/Auto.switch;.check.programmable.fan.setting.in.program;.
check.fan.settings.in.configuration.(see.“Configuration.Mode,”.Page.19)
Room.temperature.is.not.correct
Verify.wall.hole.is.plugged.with.putty.or.insulation;.check.wiring.and.location.
for.remote.sensor.if.used
LOC.displays.when.any.button.is.
pressed.or.thermostat.buttons.are.
inoperative
Thermostat.has.the.button.lockout.function.activated.(see.“Lockout.
Feature,”.Page.29)
EH.shows.on.display
Thermostat.is.in.Emergency.Heat.Mode.(see.“Operating.Modes,”.Page.25)
Very.limited.setpoint.adjustment
Thermostat.has.the.button.lockout.function.activated.(see.“Lockout.
Feature,”.Page.29)
Check.configuration.mode.settings.17.and.18,.Page.22
Problem.not.listed.above
Press.Reset.button.once*
* Reset Button Function
. Time,.day.and.mode.changed.to.last.saved.settings.(saved.after.power.loss.or.when.exiting.
program.setup),.configuration.and.program.settings.are.unchanged.
Troubleshooting
