Lennox International Inc 506586-01 installation instructions Clears after

Heat Pump Control		icomfort
LEDs
		Touch®		Possible
			Condition		Solution			Clearing Status
DS15	DS13	Thermostat		Cause(s)
Yellow	Red	Display
				Compressor has	1	Run capacitor has failed.
				a locked out due	2	Low line voltage (contact utility if voltage at discon-		Clears after
4 flashes		Critical Alert		to run capacitor		nect is low).		power reset or
	Off		Locked rotor	short, bearings				four normal
then pause		Code 404				S	Check wiring connections
				are seized,				compressor
					3	Excessive liquid refrigerant in the compressor.
				excessive liquid				cycles.
				refrigerant.	4	Compressor bearings are seized.
					1	Outdoor unit power disconnect is open.
					2	Unit circuit breaker or fuse(s) is open.
					3	Unit contactor has failed to close.
						S	Check compressor contactor wiring and
							connectors
						S	Check for compressor contactor failure
							(burned, pitted or open)
				Compressor has		S Check wiring and connectors between supply		Clears after one
				an open circuit
							and compressor	normal com-
5 flashes		Critical Alert		due to power dis-
	Off		Open circuit			S	Check for low pilot voltage at compressor	pressor run
then pause		Code 405		connection, fuse
							contactor coil	cycle or power
				is open or other
					4			reset.
				similar conditions.		High pressure switch is open and requires manual
						reset.
					5	Open circuit in compressor supply wiring or
						connections.
					6	Unusually long compressor protector reset time
						due to extreme ambient temperature.
					7	Compressor windings are damaged.
						S Check compressor motor winding resistance
					1	Run capacitor has failed.
					2	Open circuit in compressor start wiring or		Clears when
6 flashes		Critical Alert	Open start	Current not		connections.		amperage is de-
								tected in RUN
	Off			sensed by Start		S Check wiring and connectors between supply
then pause		Code 406	circuit					and START
				transformer.			and the compressor S terminal	sensors, or after
					3	Compressor start winding is damaged.
								power reset.
						S Check compressor motor winding resistance
					1	Open circuit in compressor start wiring or		Clears when
						connections.
								amperage is de-
				Current not
7 flashes		Critical Alert	Open run			S Check wiring and connectors between supply		tected in RUN
	Off			sensed by run
then pause		Code 407	circuit				and the compressor R terminal	and START
				transformer.
					2	Compressor start winding is damaged.		sensors, or after
						S Check compressor motor winding resistance		power reset.
					1			Clears after one
8 flashes		Critical Alert	Welded	Compressor		Compressor contactor failed to open.		normal com-
	Off				2	Thermostat demand signal not connected to mod-		pressor run
then pause		Code 408	contactor	always runs
						ule.		cycle or after
								power reset.
					1	Control circuit transformer is overloaded.		Clears after volt-
		Moderate/						age is higher
					2
9 flashes			Secondary low	24VAC is below		Low line voltage (contact utility if voltage at discon-		than 20VAC for
	Off	Critical Alert3
then pause			voltage	18VAC.		nect is low).		two seconds, or
		Code 409
						S	Check wiring connections	after power re-
								set.
Fast simultaneous flashing of DS11,			OEM Mode	Factory test mode.
DS13, DS14 and DS15
1. Pause duration is two (2) seconds.

2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.

3. Initially a moderate status is displayed and is escalated to critical if alarm exists for more than 10 minutes.

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