If you're looking for help fixing your Tempstar Furnace, look no further! Our comprehensive Tempstar Furnace error code guide will explain common issues, provide tips, and show you how to read your model's error codes.

CODE: Heartbeat LED pattern on solid  
PROBLEM: The control is locked out and will auto-reset after 1 hour.  
FIX: Reset power to clear the lockout. 

CODE: Two LED flashes  
PROBLEM: Pressure switch didn’t open.  
FIX: Obstructed pressure tubing; a pressure switch that’s stuck closed. 

CODE: Three LED flashes  
PROBLEM: The low-pressure switch did not close or has reopened.  
FIX: 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. 

CODE: Four LED flashes  
PROBLEM: Limit circuit fault.  
FIX: Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch. 

CODE: Five LED flashes  
PROBLEM: Abnormal flame-proving signal.  
FIX: Leaky gas valve; stuck-open gas valve. 

CODE: Six LED flashes  
PROBLEM: Ignition proving a failure.  
FIX: 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. 

CODE: Seven LED flashes  
PROBLEM: Limit circuit lockout.  
FIX: Control will auto-reset after 3 hours.  

CODE: Eight LED flashes  
PROBLEM: Gas heating lockout.  
FIX: Gas valve stuck closed on control. 

CODE: Nine LED flashes  
PROBLEM: Medium pressure switch, high-pressure switch, or PSR relay didn’t close or was reopened.  

CODE: Ten LED flashes  
PROBLEM: Polarity.  
FIX: Correct line voltage polarity. 

CODE: Status codes 1 + 2  
PROBLEM: Blower on after power up.  
FIX: Normal operation. 

CODE: Status codes 1 + 5  
PROBLEM: Blower motor lockout.  
FIX: Control will auto-reset after 3 hours.  

CODE: Status codes 3 + 5  
PROBLEM: Gas valve fault.  
FIX: RED, YELLOW, or ORANGE wire at the gas valve. 

CODE: Status codes 4 + 1  
PROBLEM: Blower motor fault.  
FIX: Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits. 

CODE: Status codes 4 + 2  
PROBLEM: Inducer motor fault.  
FIX: Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly. 

CODE: Status codes 4 + 3  
PROBLEM: The low or medium pressure switch is open while the medium or high-pressure switch is closed.  
FIX: 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. 

CODE: Status codes 6 + 1  
PROBLEM: Ignition lockout.  
FIX: Control will auto-reset after 3 hours. 

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