71
Warning Error Cause Remedy
LED Display LED Display
Hardware fault
––– ––– red
lights
Error
E10: Flash R/W Fault
Control board defective. Replace control board.
––– –––
Error
E11: Clock R/W Fault
Backup battery on control board
discharged.
Let have the backup battery be replaced
(see chapter 8.4).
On/Off timer active
–––
Warning
W12: Timer Disable
––– ––– The system is deactivated via the On/Off-
Timer.
None. If necessary adjust On/Off timer
settings.
8.1.2 Unit faults
Warning Error Cause Remedy
LED Display LED Display
External safety chain is open
red and
green
ash
Warning
W20A: 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 humidi-
stat
Max. lling level of
steam cylinder reached
Max. lling level of
steam cylinder reached but
no heating current
–––
Warning
W21A: Cyl.Max.Level
red
lights
Error
E21A: Cyl.Max.&NoCurr
Water conductivity too low (after initial
operation).
Wait until the mineral content of the cylinder
has increased
Water conductivity too low for type of steam
cylinder.
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
W22A: Max. Filltime
red
lights
Error
E22A: 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.