Nortec MES2 - Manual (Page 46)

43 | Troubleshooting
MES2 Faults
The self-diagnostic system built into the MES2 is continually monitoring the operation of the
humidifier. When an abnormal condition occurs that cannot be self corrected by the software
the MES2 will turn off power to the cylinder, drain the cylinder, and annunciate the fault using
the yellow status LED.
LED Flash Sequence
To differentiate between different fault conditions the yellow LED is flashed in different
sequences. Table 7 lists MES2 faults, their meaning, possible causes, and corrective actions.
Clearing a Fault
 Check the flash sequence against the list of fault messages and take any necessary actions
to correct the cause(s) as outlined in Table 7: Troubleshooting MES2 Faults.
 Power cycle the humidifier with the On/Off switch. Wait 3 seconds between off and on.
Table 7: Troubleshooting MES2 Faults
Yellow LED System Detected Cause Corrective Action(s)
1 flash
Excess Current
Current has exceeded
130% of max
1 Drain blocked water over
concentrated
1 Clean the drain line and drain
valve.
2 Drain solenoid not energized,
water over concentrated
2 Check and correct wiring to
drain valve.
3 Filling too fast, fill valve
damaged
3 Check fill rate and replace the
fill valve if needed.
4 Water supply too conductive 4a Contact Nortec
representative for
recommendation on alternate
cylinder
4b Change the water supply
5 Humidifier short cycling 5a Check if high limit or other
On/Off control is cycling
On/Off in less than 5
minutes. Check location and
setting of high limit.
5b Reduce the output by
turning down the capacity
potentiometer.
5c If modulating control check
if controller Pband too tight.
5d Check for temperature
swings.
6 Wrong cylinder installed 6 Install correct cylinder model
7 Cylinder Spent but not
detected by software
7 Replace the cylinder (see
maintenance chapter)
8 Condensate from other
source
8 Remove condensate returns
other than from steam line.
9 Back pressure 9 Eliminate back pressure