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8
Fault with warning light
The following hints should give you the possibility to
correct small faults or to give an exact description of
the fault to the service engineer. Because the
MELAquick
®
12
indicates the cause of fault in a
special way, it is possible to treat faults according to
the table below.
In any case, you must report the following data
to the MELAG Customer Service Department:
•
The point in time when the malfunction was
reported (for example, during the preheat phase,
during pressure generation, or during the
sterilization period).
•
The LED signal which reported the malfunction.
•
The values for pressure and temperature
indicated at this time.
•
Any unusual developments (for example,
repeated starting of the water pump).
The MELAG Customer Service Department requires
this information in order to quickly repair the
autoclave at a cost economical to you.
Fault
No.
LED
Fault
LED
Door
LED
Water
LED
Ready
LED
Run
Cause and time of fault
1
blinks
off
Supervision time for pre-heat exceeded, happens
during pre-heat phase ("Ready" blinks)
4
blinks
off
blinks Supervision time for pressure generation exceeded,
happens during pressure generation ("Running"
blinks)
5
blinks
off
blinks Supervision time for sterilization time exceeded,
happens during sterilization ("Running" lights)
9
on
blinks
Attempt to unlock sliding door during process
11
on
blinks blinks Maximum steam temperature exceeded after
autoclave was once "Ready"
12
on
blinks
off
blinks The quality (conductivity) of the feed water in the
storage tank is too bad, appears 2 sec. after the
“START” button was pressed to start a program.
15
Shown only on the print-out
Power loss during the last cycle
In every of the above cases and in case of "normal"
misoperation (pressing "start" button when autoclave
not "READY" or process already running), you will
hear a beep for 2 seconds.
On principle, you
should observe type and time of the fault (e.g.
during pre-heat phase or during pressure
generation or during sterilization) and inform the
service engineer
in order to make a quick and low-
priced repair possible.
The autoclave has to be repaired only by the
manufacturer or by an authorized engineer.
8.1
Fault No. 1 ______________________________________________________________
Cause of the fault:
The autoclave's chamber has not reached the
necessary pre-heat temperature within the
supervision time of 25
minutes (sterilization),
15 minutes (disinfection) respectively.
Time of fault:
During pre-heat phase (lamp "READY" blinks)
Call for a service engineer.
Diagnosis of fault:
1. If the chamber is warm during fault indication and
the apparatus indicates "READY" after you have
switched off
„
main“ switch and on again shortly
and waited for a few minutes, there is at least
one heating cartridge of the pre-heating
defective.
2. If the chamber does not get warm, a fuse has
failed or a plug contact is defective.
3. If the chamber heats up to approximately 150°C
(temperature of the overheat protection), there is
a short circuit in the temperature sensor of pre-
heating.
Fault correction:
1. Measure and replace heating elements.
2. Measure pre-heat output of the electronic and
replace defective elements. In case of defective
fuse, you must also check the function of
electronic exits. The semiconductor-relay should
only switch if output was directed (e.g. by test
knob, lower left side of the electronic plate). This
can be noticed by the respective lamp of the
output. Otherwise, the relay is defective and the
electronic print has to be replaced.
If somebody had been working on the autoclave
before, you should check whether the cable
shoes of the temperature sensors are sitting on
the right connector (pre-heat sensor to upper
connectors). Measure resistance values.
3. If there is a short circuit in the temperature entry
of the pre-heating, the chamber will heat up to
150°C until overheat protection is released,
without a light of lamp "READY" because the
resistance for pre-heat temperature cannot be
reached. Replace sensor.
