42
TROUBLESHOOTING
If the unit malfunctions, check out the following before calling for service.
Malfunction Check/Remedy
The unit does not operate
at all
•
The unit is not plugged correctly into a power outlet.
•
The circuit breaker at the power source is active or a power failure
has occurred.
•
The power supply removable cord is connected to the port attached
on the rear of the cabinet.
The key operation is
disabled
•
The key lock function is set in ON mode.
If the alarm function
operates
[At the beginning of operation]
•
The chamber temperature is not equal to the set value.
•
The chamber CO
2
/O
2
density is not equal to the set value.
a. The secondary pressure of the gas regulator is not equal to the
set value [for CO
2
gas; 0.03 MPa(G) (0.3 kgf/cm
2
(G), 4.4 psi(G)),
for N
2
/O
2
gas; 0.05 MPa(G) (0.5 kgf/cm
2
(G), 7.3 psi(G))].
b. The gas tube is not connected securely between the gas
regulator and the unit.
[During operation]
•
The high limit alarm temperature is not set at least 1
o
C higher than
the set chamber temperature.
•
The set temperature value was changed, or the door was left open
for a long period. Or a low temperature load was placed inside the
unit. In this case, if the unit is left as it is, the alarm will eventually
clear itself.
•
The gas tube has slipped off or the gas leaks.
•
The set value of the gas density was changed.
•
The gas cylinder is empty. Check the primary pressure of the gas
cylinder once a week. (The CO
2
primary pressure of less than 3.8
MPa(G) (38 kgf/cm
2
(G), 551 psi(G)) means a little gas in the cylinder.
Replace the cylinder soon.)
If the chamber
temperature is not
equal to the set
temperature
•
The ambient temperature must always be at least 5
o
C less than the
set temperature.
•
The outer door was closed while the inner door was left open.
If the gas density does not
coincide with the set value
•
The secondary pressure is not set to the specified value [for CO
2
gas;
0.03 MPa(G) (0.3 kgf/cm
2
(G), 4.4 psi(G)), for N
2
/O
2
gas; 0.05 MPa(G)
(0.5 kgf/cm
2
(G), 7.3 psi(G))].
•
The gas tube is clogged or chinked.
•
The humidifying pan is not filled with sterile distilled water. (Always
use sterile distilled water.)
If the chamber humidity
does not rise
•
The humidifying pan is not filled with sterile distilled water. (Always
use sterile distilled water.)
If the gas consumption is
too much
•
The door is opened frequently.
•
There is any gas leakage at the connection or pin hole on the gas
tube. It is recommended to replace the gas tube once a year.
•
The gasket of the inner door is not completely sealed.
•
The access port at the upper left corner is opened.
Summary of Contents for MCO-5M Series
Page 2: ......
