Nordmann AT4 - Resetting the Error Indication (Red LED Lights); Notes on Fault Elimination

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Warning Error Cause Remedy
LED Display LED Display
Safety chain instable
–––
Warning
W38: Safety Loop Inst
––– ––– Safety chain opens and closes in short
intervals.
Check/replace safety humidistat, ventilation
interlock and air ow monitor.
Control signal instable
–––
Warning
W39: Control Instable
––– ––– The signal at the control signal input
uctuates strongly in short intervals.
Check/replace humidity sensor or external
humidity controller.
Limit humidity signal instable
–––
Warning
W40: Limit Instable
––– ––– The signal at the limit signal input uctu-
ates strongly in short intervals.
Check/replace humidity sensor or external
humidity controller.
7.3 Resetting the error indication (red LED lights)
To reset the error indication:
Disconnect the steam air humidier from the mains. Wait approx. 5
seconds, then reconnect the unit to the mains.
Note: If the fault has not been eliminated, the error indication reappears
after a short while.
7.4 Notes on fault elimination
DANGER! Danger of electric hazard!
For the elimination of faults set the steam humidier out of operation as
described in chapter 4.4, separate the unit from the mains and secure
it against inadvertent power-up.
The elimination of faults must be carried out by qualied and well trained
professionals only.
Malfunctions relating to the electrical installation (e.g. replacement of the
backup battery, replacement of fuses) must be repaired by authorized per
sonnel or by your Nordmann representative’s service technician only.
Repair work and the replacement of faulty components must be carried out
by your Nordmann representative’s service technician only!