Nortec NH Series - Manual (Page 56)

53 | Troubleshooting
General Troubleshooting
Most operational malfunctions are not caused by faulty equipment but rather by improper
installation, or disregard for planning guidelines. Therefore, a complete fault diagnosis always
involves a thorough examination of the entire system. Often, the steam hose connection has not
been properly executed or the fault lies with the humidity control system. The following table
gives a list of possible malfunctions, the appropriate alarm or error message, details of their
cause, and notes on how to deal with each problem.
Table 15: Troubleshooting errors and warnings
Malfunction / Indication Cause Remedy
Min. Filling time too short
Error code: 1A/1B
Alarm1A
fillingtime
Error1B
Fillingtime
Steam cylinder heavily calcified.
Level in steam cylinder and level
in the float chamber do not match.
Carry out major servicing.
Level sensing unit faulty.
Test the level sensing unit is
operational by activating a drain
and noting if the LED sequence
changes, indicating a drain.
Internal safety chain
interrupted Error code: 2A/2B
Alarm2A
Safetychainint Error2
safetychainint
Connection to over-temperature
switch on steam cylinder is
broken or over-temperature
switch faulty.
Check connections or replace
over-temperature switch.
Steam cylinder overheating, over-
temperature switch has
responded.
Inspect steam cylinder, clean if
necessary. Replace over-
temperature switch.
Flat-band cable between control
and power board interrupted or
not connected.
Inspect connections, connect or
replace flat-band cable.
Door switch is disengaged.
Door switch safety connection is
closed by either pushing the
switch (such as when the door is
installed), or by pulling the switch.
Max. Filling time exceeded
(alarm message only) Error
code: 3A/3B
Alarm3A
Water supply
Water feed blocked (main water
tap closed, filter valve closed or
blocked). Water pressure too low.
Inlet valve does not open, filter
sieve in Inlet valve blocked or
inlet valve faulty. Feed hoses into
the steam humidifier not
connected or kinked. Level unit
not connected. Float in the level
unit sticking or level unit faulty.
Check water feed, open main
water tap, open or clean filter
valve. Raise water pressure
(range 1-10 bar). Inspect
electrical connections and fuse F2
on supply module. Clean filter
sieve or replace Inlet valve.
Inspect hoses into unit and
connect if necessary. Replace
faulty hoses. Connect level unit.
Clean or replace level unit.