Nortec NH Series NH System Messages cont, Page 62, 10-40, NHTC Display Message, LED state

Table 3. NH System Messages (cont)

NHTC Display Message	LED state	System Action	Symptom Diagnosed
E17: Req off current	RED	Humidifier interrupts operation	With no system demand, current is
		and the fault relay is activated.	detected in the cylinder.
W18: Foam	YEL	System will activate selected	System has detected foaming and will
		foam algorithm. (See Figure 7.)	attempt to self correct if foam mode is
			active.
E18: Foam	RED	System will activate selected	System has detected foaming and will
		foam algorithm. (See Figure 7.)	attempt to self correct if foam mode is
			active.
W19: Cylinder spent	YEL	The electronics allow the	Electronics have determined cylinder
		cylinder to be reset up to four	is spent. Within the next 72 hours the
		times before locking out the	humidifier will stop.
		humidifier.
E19: Cylinder spent	YEL, RED	Humidifier interrupts operation	Electronics have determined that the
		and the fault relay is activated.	cylinder is spent.
W20: Conductivity too low	YEL	Humidifier will continue to	Water conductivity is determined to be
		operate on this water supply.	less than optimum.
W23: Control sensor broken	YEL	Humidifier put on standby. After	Electronics cannot detect the control
		a timeout period, this warning	RH sensor connected to the
		becomes a fault.	humidifier.
E23: Control sensor broken	RED	Humidifier interrupts operation	Electronics cannot detect the control
		and the fault relay is activated.	RH sensor connected to the
			humidifier.
W24: Limit sensor broken	YEL	Humidifier put on standby. After	Electronics cannot detect the limit RH
		a timeout period, this warning	sensor connected to the humidifier.
		becomes a fault.
E24: Limit sensor broken	RED	Humidifier interrupts operation	Electronics cannot detect the limit RH
		and the fault relay is activated.	sensor connected to the humidifier.
W25: 3-day idle drain	YEL	The humidifier drains the	This safety feature drains standing
activated		cylinder after three days of	water.
		inactivity.
W26: 3-day forced drain	YEL	The humidifier drains the	This customer selected feature drains
activated		cylinder after three days of	the cylinder to remove minerals.
		operation.

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Page 62 2008-08-28