Carrier 30XW150-400 specifications Loss of communication with

Table 49 — Alarm Codes (cont)

PREFIX		SUFFIX	ALARM	ALARM DESCRIPTION			REASON FOR ALARM	ACTION TAKEN	RESET	PROBABLE CAUSE
CODE		CODE	NUMBER					BY CONTROL	TYPE
Co		A1	53	Loss of communication with			No communication	Affected	Automatic	Wrong CPM address,
				Compressor Board A			with CPM board	compressor shut		wrong unit configura-
								down		tion, wiring error, power
		B1	54	Loss of communication with
										loss, failed
				Compressor Board B
										CPM board
		E1	56	Loss of communication with			No communication with	Affected	Automatic	Wrong EXV board
				EXV Board 1			EXV board	compressor		address, wrong unit
		E2	57	Loss of communication with				shut down		configuration, wiring
										error, power loss,
				EXV Board 2
										failed EXV board
		03	64	Loss of communication with			No communication with	Disable or not allow	Automatic	Wrong board
				Energy Management Board			EMM board	EMM functions		address, wrong unit
								3 step and 4-20 mA		configuration, wiring
								and space tempera-		error, power loss to
								ture reset, occu-		module, failed module
								pancy override and
								ice build)
		05	66	Loss of communication with			No communication	Unit shut down or	Automatic	Wrong board
				AUX Board 6			with MLV/COND Board	not allowed to start		address, wrong unit
										configuration, wiring
										error, power loss to
										module, failed module
P		01	67	Cooler Freeze Protection			Entering or leaving therm-	Unit shut down or	Automatic, first	Faulty thermistor, faulty
							istor sensed a tempera-	not allowed to start	occurrence in	wiring, low water flow,
							ture at or below freeze		24 hours;	low loop volume, fouled
							point		manual if	cooler, or freeze
									multiple alarms	conditions
									within 24 hours
		02	68	Condenser Freeze Protection			—	None	Automatic	Configuration error
				Circuit A
		03	69	Condenser Freeze Protection
				Circuit B
		05	71	Circuit A Low Suction			Low saturated suction	Circuit shut down	Automatic, first	Faulty thermistor, faulty
				Temperature			temperatures detected for		occurrence in	wiring, low water flow,
							a period of time		24 hours;	low loop volume, fouled
		06	72	Circuit B Low Suction
									manual if	cooler, or freeze
				Temperature
									multiple alarms	conditions
									within 24 hours
		08	74	Circuit A High Suction			EXV>98%,	Circuit shut down	Manual	Faulty transducer,
				Superheat			suction superheat > 30 F,			faulty wiring, faulty
		09	75	Circuit B High Suction			and SST<MOP for more			thermistor, faulty EXV,
							than 5 minutes			low refrigerant charge,
				Superheat
										plugged or restricted
										liquid line
				LEGEND
CCN	— Carrier Comfort Network®				MLV	— Minimum Load Valve
CPM	— Compressor Protection Module				MOP	— Maximum Operating Pressure
EMM	— Energy Management Module				MTA	— Must Trip Amps
EWT	— Entering Water Temperature				SST	— Saturated Suction Temperature
EXV	— Electronic Expansion Valve				UL	— Underwriters Laboratories
HPS	— High Pressure Switch

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