Nordmann DC4 - 6.2.2 Unit Faults

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6.2.2 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 humi-
distat
Max. lling level of
steam cylinder reached
Max. lling level of
steam cylinder reached but
no heating current
–––
Warning
W21: Cyl.Max.Level
red
lights
Error
E21: Cyl.Max.&NoCurr
Water conductivity too low (after initial
operation).
Wait until the mineral content of the cylinder
has increased
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.
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.
Max. admissible electrode
current exceeded
Max. admissible electrode
current exceeded
–––
Warning
W25: Excess Current
red
lights
Error
E25: Excess Current
Drain pump defective. Inspect drain pump, replace if necessary.
Drain in steam cylinder blocked. Replace the steam cylinder.