Tempstar Furnace Error Codes

Error CodesWhat this meansHow to fix it
Heartbeat LED pattern on solidThe control is locked out and will auto-reset after 1 hour.Reset power to clear the lockout.
Two LED flashesPressure switch didn’t open.Obstructed pressure tubing; a pressure switch that’s stuck closed.
Three LED flashesThe low-pressure switch did not close or has reopened.Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing.
Four LED flashesLimit circuit fault.Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch.
Five LED flashesAbnormal flame-proving signal.Leaky gas valve; stuck-open gas valve.
Six LED flashesIgnition proving a failure.Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn’t be grounded.
Seven LED flashesLimit circuit lockout.Control will auto-reset after 3 hours. Refer to status code #4.
Eight LED flashesGas heating lockout.Gas valve stuck closed on control.
Nine LED flashesMedium pressure switch, high-pressure switch, or PSR relay didn’t close or was reopened.Refer to status code #3.
Ten LED flashesPolarity.Correct line voltage polarity.
Status codes 1 + 2Blower on after power up.Normal operation.
Status codes 1 + 5Blower motor lockout.Control will auto-reset after 3 hours. Refer to status code #4 + 1.
Status codes 3 + 5Gas valve fault.RED, YELLOW, or ORANGE wire at the gas valve.
Status codes 4 + 1Blower motor fault.Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits.
Status codes 4 + 2Inducer motor fault.Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly.
Status codes 4 + 3The low or medium pressure switch is open while the medium or high-pressure switch is closed.Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing.
Status codes 6 + 1Ignition lockout.Control will auto-reset after 3 hours. Refer to status code #6.