Nortec NH Series installation manual Troubleshooting Symptoms, System What to Check Why

Table 1. Troubleshooting Symptoms

System	What to Check	Why
Nothing is happening when the	Main power is on and matches the	No, or improper voltage can cause the
on/off switch is turned on	specified voltage on the specification label.	electronics or components not to respond.
	24 VAC output from the step-down	24 VAC is required to power nearly all the
	transformer. Check high and low voltage.	components of the humidifier, including the
		electronics.
	Ensure that fuses in the humidifier and on	The fuses are in place to prevent damage
	the electronic boards are good. Ensure	to the electronics. If there was a surge the
	that 24 VAC is getting to the main board.	fuse may have blown to prevent damage
		to the unit.
	Door interlock open.	The door interlock has malfunctioned.
The unit will not fill or fills very	Water supply is on and water pressure is	The proper water volume and pressure
slowly (less then 1” per minute)	between 30 to 80 psig	must be available as the valves in the NH
		unit rely on its pressure to control volume
		and operation. NORTEC recommends 55
		to 60 PSIG.
	Unit is getting a demand signal or the unit	The unit will not activate the fill valve
	is producing the required steam capacity.	without a demand for humidity. It will also
	See ensuring demand Table 2.	only fill as necessary once there is a
		demand. Once it reaches the requested
		demand, it will stop filling.
	No leak at drain valve or around cylinder.	The cylinder is held in by gravity and
	Check for water coming out of the drain.	sealed by an O-ring. If not properly seated,
	Check the fill valve inlet.	it could leak and prevent the unit from
	Check fill valve strainer.	filling.
	Check optional inline filter.	Drain stuck open
		Pressure in the steam line could also
		prevent filling causing the water in the fill
		cup to overflow to drain.
		Strainer is clogged.
		Fill valve may also be restricted after
		capturing debris in its filter.
Unit will not humidify or is not	Unit is getting a demand signal. Refer to	Unit will not send power to the cylinder
reaching requested capacity.	Table 2.	without a demand and safeties met.
	Capacity is manually limited.	The unit will not surpass the capacity
		dictated by the user in the software.
	Cylinder is full.	The unit will not fill further than a full
		cylinder. Operation requires it to try to
		concentrate the conductivity, which may
		take several hours, before it reaches full
		capacity.
Unit has faulted or has a	Check Table 3, Faults and Warning Codes	Each code is identified and each has
warning		individual causes and solutions.

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Page 57 2008-08-28