Nortec NHDI - Manual (Page 26)

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TROUBLE-SHOOTING
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.
Malfunction / Indication Cause Remedy
Min. Filling time too short
Error code: 1A/1B
Water feed to steam cylinder heavily
calcified.
Level in steam cylinder and level unit
do not match.
Carry out major servicing.
Internal safety chain interrupted
Error code: 2A/2B
Connection to over-temperature
switch on steam cylinder broken or
over-temperature switch faulty.
Steam cylinder overheating,
over-temperature switch has
responded.
Flat-band cable between control and
power board interrupted or not
connected.
Check connections or replace
over-temperature switch.
Inspect steam cylinder, clean if
necessary. Replace over-temperature
switch.
Inspect connections, connect or
replace flatband cable.
Max. Filling time exceeded (alarm
message only)
Error code: 3A/3B
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.
Max. Boil down rate too long
Error code: 4A/4B
Individual heating elements faulty.
Main voltage too low or failure of a
phase (L1, L2 or L3).
Steam line too long or not insulated.
Replace faulty heating elements.
Replace fuses on power board.
Check main voltage and
connections.
Maintain maximum line lengths
(max. 15’). Insulate steam lines.
Max. Drain time exceeded
Error code: 5A/5B
Drain pump not connected or faulty.
Outlet line from unit kinked or
blocked.
Water outlet blocked (external outlet
line or siphon blocked.
Hose to level unit blocked.
Connect or replace drain pump.
Inspect outlet line from unit, replace if
necessary.
Clean water outlet line and siphon.
Clean or replace hose.
Alarm 1A
filling time
Error 1B
filling time
Alarm 2A
safety chain int
Error 2B
safety chain int
Alarm 3A
water supply
Error 4B
steam time
Alarm 4A
steam time
Alarm 5A
drain
Error 5B
drain