Nordmann AT4 Operating Instructions Manual page 61

7.2.2 Unit faults
Warning
LED Display
External safety chain is open
red and
Warning
green
W20: Safety Loop Open
flash
Max. filling level of
steam cylinder reached
–––
Warning
W21: Cyl.Max.Level
Permissible filling time exceeded
(20 minutes)
–––
Warning
W22: Max. Filltime
No electrode current for more than
20 minutes
–––
Warning
W23: No Current
Electrode current in relation to the
steam demand too high
–––
Warning
W24: Over Current
Error
LED Display
––– –––
Max. filling level of steam cylinder
reached but no heating current for
more than 30 minutes
red
Error
lights
E21: Cyl.Max. & NoCurr
Permissible filling time exceeded
(more than 4 hours)
red
Error
lights
E22: Max. Filltime
No electrode current for more than
4 hours
red
Error
lights
E23: No Current
Electrode current in relation to the
steam demand too high
red
Error
lights
E24: Over Current
Cause
Ventilation interlock open.
Air flow monitor triggered.
Safety humidistat triggered.
Water conductivity too low (after initial op-
eration).
Water conductivity too low for the selected
steam cylinder type.
Phase failure heating voltage.
Water supply obstructed/shut-off valve
closed/water pressure too low.
Inlet valve blocked or defective.
Excessive back pressure in the steam line
(duct pressure too high, steam line too long or
kinked), causing water loss via filling cup.
Leakage in the water system.
Phase failure heating voltage.
Water supply obstructed/shut-off valve
closed/water pressure too low.
Inlet valve blocked or defective.
Excessive back pressure in the steam line
(duct pressure too high, steam line too long or
kinked), causing water loss via filling cup.
Leakage in the water system.
Humidity demand has decreased too fast. Automatic adaptation of the operating
Drain pump defective.
Drain in steam cylinder blocked.
Water conductivity too high for the selected
steam cylinder type.
Remedy
If applicable, check/turn on ventilation
system.
Check ventilator/filter of the ventilation
system.
Wait. If applicable, check safety humidistat
Wait until the mineral content of the cylinder
has increased
Select correct steam cylinder type.
Check service switch in the mains supply
line and switch on if applicable. Check mains
fuse(s) and replace if applicable.
Inspect water supply (filter, water piping,
etc.), check/open shut-off valve, check water
pressure.
Inspect strainer insert in the inlet valve, if
applicable clean strainer insert or replace
inlet valve.
Check duct pressure, inspect steam installa-
tion. If applicable install pressure compensa-
tion kit (see options).
Inspect water system and seal if necessary.
Inspect/turn on service switch of the mains
supply line. Inspect the fuses of the mains
supply, replace if necessary. Check/repalce
main contactor.
Inspect water supply (filter, water piping,
etc.), check/open shut-off valve, check water
pressure.
Inspect strainer insert of the inlet valve, if
applicable clean strainer insert or replace
inlet valve.
Check duct pressure, inspect steam installa-
tion. If applicable install pressure compensa-
tion kit (see options).
Inspect water system and seal if necessary.
point.
Inspect drain pump, replace if necessary.
Replace steam cylinder.
Select correct steam cylinder type.
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