Nortec NH-EL Series - Manual (Page 75)

Troubleshooting | 72
General Troubleshooting
The following section provides general guidelines for troubleshooting the NH-EL humidifier and
auxiliary components. For detailed troubleshooting information refer to the manuals that were
provided with the auxiliary equipment and to Table 11: Troubleshooting Warnings and Faults
later in this chapter.
Humidifier
Table 10: 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 fuses (F2 and F3) on
driver board.
2 Incorrect or no Voltage 2a Check voltage against spec label and
correct.
2b Check disconnect and ensure humidifier
is getting power.
3 Step Down Transformer not
outputting 24VAC
3a Replace the transformer.
3b Verify primary wiring.
4 Door interlock switch open 4a Replace the door
4b Pull door interlock switch out to
override.
Caution! The electrical and plumbing
compartment contains high voltage
components and wiring.
Humidifier will not humidify
or not reaching RH setpoint 1 Security loop open
1a Check if “Security loop”: “Security loop”
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 27% 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 27% 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.