Table 1. Troubleshooting Symptoms - Nortec NH Series Installation Manual

System
Nothing is happening when the
on/off switch is turned on
The unit will not fill or fills very
slowly (less then 1" per minute)
Unit will not humidify or is not
reaching requested capacity.
Unit has faulted or has a
warning
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2008-08-28

Table 1. Troubleshooting Symptoms

What to Check
Main power is on and matches the
specified voltage on the specification label.
24 VAC output from the step-down
transformer. Check high and low voltage.
Ensure that fuses in the humidifier and on
the electronic boards are good. Ensure
that 24 VAC is getting to the main board.
Door interlock open.
Water supply is on and water pressure is
between 30 to 80 psig
Unit is getting a demand signal or the unit
is producing the required steam capacity.
See ensuring demand Table 2.
No leak at drain valve or around cylinder.
Check for water coming out of the drain.
Check the fill valve inlet.
Check fill valve strainer.
Check optional inline filter.
Unit is getting a demand signal. Refer to
Table 2.
Capacity is manually limited.
Cylinder is full.
Check Table 3, Faults and Warning Codes Each code is identified and each has
Why
No, or improper voltage can cause the
electronics or components not to respond.
24 VAC is required to power nearly all the
components of the humidifier, including the
electronics.
The fuses are in place to prevent damage
to the electronics. If there was a surge the
fuse may have blown to prevent damage
to the unit.
The door interlock has malfunctioned.
The proper water volume and pressure
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.
The unit will not activate the fill valve
without a demand for humidity. It will also
only fill as necessary once there is a
demand. Once it reaches the requested
demand, it will stop filling.
The cylinder is held in by gravity and
sealed by an O-ring. If not properly seated,
it could leak and prevent the unit from
filling.
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 send power to the cylinder
without a demand and safeties met.
The unit will not surpass the capacity
dictated by the user in the software.
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.
individual causes and solutions.