Nortec MES2 User Manual download pdf (Page 44)

41 | Troubleshooting

General Troubleshooting

The following section provides general guidelines for troubleshooting the MES2 humidifier and

auxiliary components. For detailed troubleshooting information refer to the manuals that were

provided with auxiliary equipment and to Table 7: Troubleshooting MES2 Faults on page 43.

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 between

On/Off/Drain switch and control

board.

2 Incorrect Voltage 2 Check voltage supplied to

On/Off/Drain switch is 24 VAC.

3 Mains power turned off 3 Turn on mains power.

Humidifier will not humidify or

not reaching RH setpoint

1 Safety loop open. No 24 VAC at

1a Check if there is 24 VAC at point 2 of

Terminal P3 on the control board.

1b Check if air handler is outputting 24

VAC run signal.

1c Check wiring and operation of On/Off

devices connected in series between

output calling for humidity and point 2

of terminal P3.

2 No demand signal (If J10

removed for modulation)

2 Check voltage between P5 and

ground. 25% of full-scale signal must

be present for humidifier to start.

3 Not configured correctly for

On/Off or modulating control

3 Check that J10 on control board is

removed for modulating control and

installed for On/Off control.

4 Capacity has been manually

limited

4 Check Manual Capacity adjustment

potentiometer. Clockwise increases

capacity.

5 Low conductivity water

6 Humidifier undersized

5 Check if yellow LED is on. If operated

on low conductivity water it may take

several hours for the MES2 to reach

full output capacity. This is normal.

During this time the humidifier will not

perform any drains and the

conductivity of the water in the

cylinder will increase.

Humidifier has faulted and

yellow LED is flashing

1 Software has detected an

abnormal condition

1 Refer to Table 7: Troubleshooting

MES2 Faults.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 53 54

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Nortec MES2 User Manual Page 44

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