Nortec NHPC User Manual

69 | Troubleshooting
General Troubleshooting
The following section provides general guidelines for troubleshooting the NHTC/PC humidifier
and auxiliary components. For detailed troubleshooting information refer to the manuals that
were provided with the auxiliary equipment and to Table 8: Troubleshooting NHTC/PC Warnings
and Faults later in this chapter.
Humidifier
Table 6: General Troubleshooting
Symptom Cause Corrective Action(s)
Nothing happens when On/Off
switch is turned on.
1 Fuse blown
1 Check inline fuse in yellow housing
between transformer and driver board.
Check and replace fuse on driver
board.
2 Incorrect or no Voltage 2a Check voltage against spec label and
correct.
2b Check disconnect and insure
humidifier is getting power.
3 Step Down Transformer not
outputting 24VAC
3 Replace the transformer
4 Door interlock switch open 4a Replace the door
4b Pull door interlock switch out to
override.
Caution! The electrical and plumbing
compartment contain high voltage
components and wiring.
Humidifier will not humidify or
not reaching RH setpoint
1 Safety loop open 1a Check if W11: Safety loop open is
displayed on the humidifier’s display.
1b Check if there is 24 VAC at terminal
2.
1c Check wiring and operation of On/Off
devices connected to terminal 1 and
2. Ensure they are closing when they
should be.
2 High limit limiting output 2 Check if the high limit is installed too
close to the humidifier and if it is
operating correctly.
3 No signal on Channel 1 3 Check voltage between terminal 3 and
4. For demand configuration 25% of
full scale signal must be present for
humidifier to start. For transducer
configuration the signal must be lower
than setpoint for the humidifier to
start.
4 No signal on Channel 2
(For units configured for dual
channel operation).
4 Check voltage between terminal 5 and
3. For demand configuration 25% of
full scale signal must be present for
humidifier to operate. For transducer
configuration the signal must be lower
than setpoint for the humidifier to
start..

Nortec NHPC Specifications

General

Brand	Nortec
Model	NHPC
Category	Humidifier
Language	English