Nortec NHDI - Manual (Page 27)

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Malfunction / Indication Cause Remedy
Invalid level
Error code: 6A/6B
Level unit faulty.
Magnetic field in vicinity of level unit.
Replace level unit.
Eliminate magnetic field.
Steam pressure (error only)
Error code: 7A/7B
Steam hose blocked or restricted
(water trap).
Pressure balance adapter into steam
connection fitting blocked.
Duct pressure too high (>1500 Pa).
Inspect steam hose, clean if
necessary and install correctly.
Remove adapter and clean opening
with a needle.
Inspect ventilation settings.
External safety chain interrupted
Error code: none
Ventilator lock open.
Automatic flow control has
responded.
Safties are open.
Switch on ventilator/ventilation
system.
Inspect ventilator/filter of ventilation
system.
Servicing, inspect system if
necessary.
Main failure on Unit B. Inspect voltage supply to Unit B.
Alarm 6A
level indicat
Error 6B
level indicat
Alarm 7A
communication
safety chain
external A
mains failure
B
LEGEND
A = Circuit 1
B= Circuit 2 (double unit 2nd
cylinder)