Response: See Figure #2, NHMC/NHP System Messages
4. Max. Filling Time - Error 3
Symptom(s) Diagnosed: Time dependent.
Neither Maximal Level (full cylinder) is detected, nor is there enough current drawn to meet capacity demand. Current monitored on primary lead to cylinder is greater than zero and not decreasing. The unit will have tried to
Probable Cause(s):
1.Steam line restriction causing back pressure.
2.Improper fill rate.
3.Leaking drain valve
4.Full cylinder not detected.
Unit Takes
Corrective Action:
1.Check for water leaking from drain. If present, correct the drain valve deficiency (check for debris holding drain coil plunges open).
2.Ensure the steam line, from the cylinder outlet to the steam distributor (duct or blower pack), is properly installed, to ensure back pressure is not the case.
3.Check water level in cylinder.
4.If full reset unit and ensure there is a demand for steam (the green LED on unit door will stay illuminated. Maximal Level should be indicated on the LCD display and both green and yellow LED is on the unit door illuminate almost immediately. If Maximal Level is not indicated, a problem exists with the high water sensor circuitry.
a)Check wiring of the high water sensor PCB (refer to unit wiring diagram).
b)Check for amperage on all wires at the cylinder, with an amp probe (amp clamp). If amperage is not detected on all wires, correct primary wiring deficiency. If amperage is detected on all wires, proceed to next step.
c)Place a jumper across 42 and 48 of main PCB for five seconds. If Maximal Level is not
displayed and the fill valve does not energize (green LED must be illuminated), the main PCB is defective. If Maximal level is displayed, a problem exists with the cylinder or the high water sensor PCB. A voltage of 85 VAC or greater across the orange wires of the high water PCB ( one orange wire terminates at the white sensor plug attached to the soldered pin of the cylinder, the other terminates at one of the contactor connections) will signal a full cylinder (Maximal Level) to the main pcb. If this voltage does exist, the problem is with the high water PCB, if not, the problem is within the cylinder (can be caused by cylinder being past end of life.
5.If not full, drain cylinder, reset unit, and check the fill rate (refer to Figure #2 ). If the fill rate is correct, back pressure is the likely cause and should be rechecked.
Response: See Figure #2, NHMC/NHP System Messages.
5. Cylinder Spent - Error 4
Symptom(s) Diagnosed: Water level stays high,
cycling on and off Maximal Level (full cylinder), without an increase in output/amp draw or reaching demand.
Probable Cause(s):
1.Cylinder has reached end of life due to insulative mineral coating on electrodes.
2.New cylinder start up with low incoming water conductivity.
Corrective Action:
1.If the cylinder is not new, replace the cylinder immediately. Within approximately three days, the unit will shut itself down on Error 9 resulting in no output instead of reduced output.
2.If the cylinder is new, the electronics will differentiate cylinder spent from new cylinder start up and the displayed error will discontinue without a shutdown on Error 9.
Response: See Figure #2, NHMC/NHP System Messages.
6. No Current - Error 5
Symptom(s) Diagnosed: Time dependent. No
current sensed by the electronics on the monitored primary lead to the cylinder. The unit will have tried to self correct prior to system shutdown by pulse activating the drain valve, to possibly clear any debris holding the drain valve open.
Probable Cause(s):
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