Lennox International Inc Dave Lennox Signature Collection XC17 Air Conditioner, 506510-01

Table 10. Compressor LED Alert Codes

Outdoor Main
Control LEDs			Possible
		Condition		Solution			Clearing Status
DS15	DS13		Cause(s)
Yellow	Red
				1	Compressor protector is open.
					S Check for high head pressure
			Thermostat		S Check compressor supply voltage		Clears the error after current
				2
		Compressor	demand signal Y1		Outdoor unit power disconnect is open.		is sensed in the run and
OFF	ON	Internal	is present, but	3	Compressor circuit breaker or fuse(s) is open.		start winding for two
		Overload Trip	compressor not	4	Broken wire or connector is not making contact.		seconds, service removed
			running	5	Low or high pressure switch open if present in the		or power reset.
					system.
				6	Compressor contactor has failed to close.
				1	Low refrigerant charge.
				2	Evaporator blower is not running.
					S Check blower relay coil and contacts
					S Check blower motor capacitor
					S Check blower motor for failure or blockage
					S Check evaporator blower wiring and connectors
					S Check indoor blower control
					S Check thermostat wiring for open circuit
				3	Evaporator coil is frozen.
					S Check for low suction pressure
					S Check for excessively low thermostat setting
1 Flashes			Compressor is		S Check evaporator airflow (coil blockages or return		Clears the error after 30
then	OFF	Long run time.	running extremely			air filter)	consecutive normal run
Pause			long run cycles.		S Check ductwork or registers for blockage.		cycles, or after power reset.
				4	Faulty metering device.
					S Check TXV bulb installation (size, location and
						contact)
					S Check if TXV/fixed orifice is stuck closed or de-
						fective
				5	Condenser coil is dirty.
				6	Liquid line restriction (filter drier blocked if present).
				7	Thermostat is malfunctioning.
					S Check thermostat sub−base or wiring for short cir-
						cuit
					S Check thermostat installation (location and level)
				1	High head pressure.
					S Check high pressure switch if present in system
					S Check if system is overcharged with refrigerant
			Indicates the		S Check for non−condensable in system
2 Flashes		System	compressor	2	Condenser coil poor air circulation (dirty, blocked,		Clears after four
then	OFF		protector is open		damaged).		consecutive normal
		Pressure Trip	or missing supply				compressor run cycles, or
Pause				3	Condenser fan is not running.
			power to the				after power reset.
			compressor.		S	Check fan capacitor
					S Check fan wiring and connectors
					S Check fan motor for failure or blockage
				4	Return air duct has substantial leakage.
3 Flashes			Compressor is	1	Thermostat demand signal is intermittent.		Clears after four
				2	Time delay relay or Main Control is defective.		consecutive normal
then	OFF	Short Cycling	running less than
				3	If high pressure switch is present, see Flash Code 2		compressor run cycles, or
Pause			three minutes.
					information.		after power reset.
			Compressor has	1	Run capacitor has failed.
			a locked out due	2	Low line voltage (contact utility if voltage at disconnect
4 Flashes			to run capacitor		is low).		Clears after power reset or
then	OFF	Locked Rotor	short, bearings				four normal compressor
					S	Check wiring connections
Pause.			are seized, ex-				cycles.
				3	Excessive liquid refrigerant in the compressor.
			cessive liquid re-
			frigerant.	4	Compressor bearings are seized.

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XC17 SERIES