Lennox International Inc Dave Lennox Signature Collection XP17 System HEAT PUMPS, 506586-01 Page

Table 15. Compressor Fault and Lockout LED Codes and Related icomfort Touch® Thermostat Alert Codes

NOTE able below for duration of fast / slow flashes and pause.

Heat Pump Control		icomfort
LEDs
		Touch®		Possible
			Condition		Solution		Clearing Status
DS15	DS13	Thermostat		Cause(s)
Yellow	Red	Display
					1	Compressor protector is open.
						S Check for high head pressure	Clears the error
				Thermostat		S Check compressor supply voltage	after current is
					2 Outdoor unit power disconnect is open.		sensed in the
		Moderate/	Compressor	demand signal Y1
Off	On	Critical3 Alert	internal	is present, but	3 Compressor circuit breaker or fuse(s) is open.		run and start
							winding for two
		Code 400	overload trip	compressor not	4
						Broken wire or connector is not making contact.	seconds, ser-
				running	5	Low or high pressure switch open if present in the	vice removed or
						system.	power reset.
					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 connec-
						tors
						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	Clears the error
1 flash		Critical Alert		Compressor is		S Check evaporator airflow (coil blockages or re-	after 30 consec-
	Off		Long run time.	running extremely		turn air filter)	utive normal run
then pause		Code 401
				long run cycles.			cycles, or after
						S Check ductwork or registers for blockage.
							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
						circuit
						S Check thermostat installation (location and lev-
						el)
					1	High head pressure.
						S Check high pressure switch if present in sys-
						tem
				Indicates the		S Check if system is overcharged with refrigerant	Clears after four
						S Check for non−condensable in system
				compressor			consecutive
					2 Condenser coil poor air circulation (dirty, blocked,
2 flashes	Off	Critical Alert	System	protector is open			normal com-
then pause		Code 402	pressure trip	or missing supply		damaged).	pressor run
				power to the	3 Condenser fan is not running.		cycles, or after
				compressor.		S Check fan capacitor	power reset.
						S Check fan wiring and connectors
						S Check fan motor for failure or blockage
					4	Return air duct has substantial leakage.
					1	Thermostat demand signal is intermittent.	Clears after four
		Moderate		Compressor is			consecutive
					2
3 flashes						Time delay relay or heat pump control is defective.	normal com-
	Off	Alert Code	Short cycling	running less than
then pause					3	If high pressure switch is present, see flash code 2	pressor run
		403		three minutes.
						information.	cycles, or after
							power reset.

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XP17 SERIES