American Standard Furnace Error Codes

If you need to know what the signals of your American Standard furnace mean, you can find the necessary information about it here. The tables presented on this page are the lists of American Standard furnace error codes with their explanations and possible problem solutions.

The signals are sorted by LED color and number of flashes which you observe. The meanings are given for all kinds of faults, for example, 2 flashes are described as system lockout, and 3 flashes have several meanings possible. For some modifications there are also alert codes given to provide better understanding of nature of the issue.

American CDB1 Standard Furnace Error Codes

LED Color	Fault LED	Alert Code	Description	Control Display
Red		90	Excessive Communication Errors	N/A
	1 Flash	91	Loss of Heat/Cool Demand Message (COMM)	ERR 91
			Loss of Bit Master (Clock Signal)
	2 Flash		Defrost Fault A
	3 Flash	68	Defrost Fault B and/or C	N/A
	4 Flash		Defrost Fault A and [B and/or C]
	5 Flash	67	Ambient Temperature Sensor Fault (Out of Range – Open or Shorted)	ERR 67
	6 Flash		Coil Temperature Sensor Fault (Out of Range – Open or Shorted)
			Low Pressure Cut Out Fault (Open outside of defrost Cycle-Hard lock out, cycle power to reset)	ERR 79
	7 Flash	79	Low Pressure Cut Out Fault Heat/Cool Lock out
			Low Pressure Cut Out Fault (Open outside of defrost Cycle-Short lock out)	Wait n
	10 Flash	102	Y2 without Y1 – Miswire (24 volt mode only)	N/A
	11 Flash	67	Liquid Temperature Sensor Fault (Out of Range – Open or Shorted)	N/A
	12 Flash	113	Liquid Pressure Sensor Fault (Out of Range – Open or Shorted)	ERR 113
	13 Flash	67	External Outdoor Temperature	N/A
			Sensor Fault (Out of Range – Shorted)
			PM Missing with local copy (Operational)	ERR 114
			Bad Data in PM with local copy (Operational)	N/A
	14 Flash	114	Bad Data in PM no local copy (Not Operational)	ERR 114
			PM Missing with no local copy (Not Operational)
	15 Flash *	50	Duplicate OD Temperature Sensor *	N/A
	16 Flash *	123	Demand Configuration Fault *	N/A

American TUY060R9V3W Standard Furnace Error Codes

LED Color	Charge Assist™ (CA) LEDs	Flashing	Description
Green	CHARGED	Off	Charged or not in CA Mode
		On	Charge is Correct
	Y1	On	1 st stage compressor requests
	Y2	On	2nd stage compressor request
		Fast Flash	Initialization at Power Up ~ 60 seconds
		Med Flash	Oil Return Mode ** (Forced Defrost)
	STATUS	Slow Flash	Standard operation
		Off	Charge Assist™ mode or no power to control
	LitePort	Occasional Flash	For transmitting LitePort™ data
Amber	COM	Flashing	Flash device count when in communication (number of COMM products connected in system); Rapid flashes followed by a pause indicates disrupted communications
		Off	No power
		On	Solid at power-up
		Flashing	See Stabilization Flash Rate
	CHARGING	Off	Not in CA Mode
	ADD	On	System requires refrigerant charge (Control has 24 volt AC output to Charqe Solenoid)
Red	ODT	Flashing	Ambient Temperature is out of range – Ambient Temperature must be above 55°F and below 120°F to enter CA Mode A/ore: ODT LED will flash 1 sec ON/OFF for 30 seconds and the CHARGING LED will flash 5 times per second for 2 seconds, then exit CA.
	RECOVER	On	Need to recover refrigerant – Unit locked out for 1 hour or press mode button to exit Charge Assist™
	LOW	On	Liquid pressure below 90 psig – Liquid pressure must be above 90 psig to enter CA Mode
			Note: LOW oressure LED will be on for 30 seconds and the CHARGING LED will flash 5 times per second for 2 seconds, then exit CA.

American AUY060R9V3W Standard Furnace Error Codes

LED	Description
2 Flashes	System Lockout (Retries or Recycles exceeded)
3 Flashes	Draft Pressure Error – Possible problems:
	a) Venting problem
	b) Pressure switch problem
	c) Inducer problem
4 Flashes	Open Temperature Limit Switch
5 Flashes	Flame sensed when no flame should be present
6 Flashes	115 volt AC power reversed, ignitor (Triac) fault, poor grounding or system voltage too low
7 Flashes	Gas valve circuit error
8 Flashes	Low flame sense
9 Flashes	Open Inducer Limit switch
10 Flashes	Inducer communication error
Solid	Internal GV error or Low TH voltage
Solid Red w/Solid Green “STATUS” LED	Continuous Reset caused by a blown fuse or internal error.