Nordmann AT4 - Page 61

61
7.2.2 Unit faults
Warning Error Cause Remedy
LED Display LED Display
External safety chain is open
red and
green
ash
Warning
W20: Safety Loop Open
––– ––– Ventilation interlock open. If applicable, check/turn on ventilation
system.
Air ow monitor triggered. Check ventilator/lter of the ventilation
system.
Safety humidistat triggered. Wait. If applicable, check safety humidistat
Max. lling level of
steam cylinder reached
Max. lling level of steam cylinder
reached but no heating current for
more than 30 minutes
–––
Warning
W21: Cyl.Max.Level
red
lights
Error
E21: Cyl.Max. & NoCurr
Water conductivity too low (after initial op-
eration).
Wait until the mineral content of the cylinder
has increased
Water conductivity too low for the selected
steam cylinder type.
Select correct steam cylinder type.
Phase failure heating voltage. Check service switch in the mains supply
line and switch on if applicable. Check mains
fuse(s) and replace if applicable.
Permissible lling time exceeded
(20 minutes)
Permissible lling time exceeded
(more than 4 hours)
–––
Warning
W22: Max. Filltime
red
lights
Error
E22: Max. Filltime
Water supply obstructed/shut-off valve
closed/water pressure too low.
Inspect water supply (lter, water piping,
etc.), check/open shut-off valve, check water
pressure.
Inlet valve blocked or defective. Inspect strainer insert in the inlet valve, if
applicable clean strainer insert or replace
inlet valve.
Excessive back pressure in the steam line
(duct pressure too high, steam line too long or
kinked), causing water loss via lling cup.
Check duct pressure, inspect steam installa-
tion. If applicable install pressure compensa-
tion kit (see options).
Leakage in the water system. Inspect water system and seal if necessary.
No electrode current for more than
20 minutes
No electrode current for more than
4 hours
–––
Warning
W23: No Current
red
lights
Error
E23: No Current
Phase failure heating voltage. Inspect/turn on service switch of the mains
supply line. Inspect the fuses of the mains
supply, replace if necessary. Check/repalce
main contactor.
Water supply obstructed/shut-off valve
closed/water pressure too low.
Inspect water supply (lter, water piping,
etc.), check/open shut-off valve, check water
pressure.
Inlet valve blocked or defective. Inspect strainer insert of the inlet valve, if
applicable clean strainer insert or replace
inlet valve.
Excessive back pressure in the steam line
(duct pressure too high, steam line too long or
kinked), causing water loss via lling cup.
Check duct pressure, inspect steam installa-
tion. If applicable install pressure compensa-
tion kit (see options).
Leakage in the water system. Inspect water system and seal if necessary.
Electrode current in relation to the
steam demand too high
Electrode current in relation to the
steam demand too high
–––
Warning
W24: Over Current
red
lights
Error
E24: Over Current
Humidity demand has decreased too fast. Automatic adaptation of the operating
point.
Drain pump defective. Inspect drain pump, replace if necessary.
Drain in steam cylinder blocked. Replace steam cylinder.
Water conductivity too high for the selected
steam cylinder type.
Select correct steam cylinder type.