Kendro HERAcell 150, Operating Instructions Manual

Page: 52 / 251

CO
2
Incubator HERAcell ® 150 Operating Instructions
52
6. Handling and control
6.12 Failure code list
Code Description Cause Repair
???
No values displayed
Communication between
display and CPU- main
board faulty
Contact Service
42 NV RAM read failure
NV RAM faulty,
default values loaded
Contact Service
43 NV RAM read failure
NV RAM faulty,
mirrored values loaded
Contact Service
44 NV RAM faulty
CO
2
measuring cell values
not overwritten, device works
with default values
Contact Service
54 Manipulated variable failure
Calculation error, device
performed RESET
Contact Service
55
I
2
C bus failure
Data transfer faulty,
measured value quality
dropped below 50 %
Eliminate source of interference, e.g.
cellular phone
66 Deviation of temperature
sensors from one another Temperature signal
plausibility doubtful Contact Service
77
CO
2
cal range exceeded
Max. adjustment value
exceeded Contact Service
88 Failure upon auto-start Total time elapsed or max.
adjustment value exceeded Repeat auto-start
99 Device doors open Doors open for more than
10 minutes, door switch Close device doors, test door switch for
correct function
100 Temperature below nominal
value Actual value < nominal
value –1° C Contact Service
101 Temperature above nominal
value Actual value > nominal
value +1° C Do not exceed ambient temperature limit
104 Temperature sensor faulty Sensor circuit open/shorted Contact Service
201
CO
2
above nominal value
Act. val. > nom. val. +1 %
• Prepressure high Check gas supply:
• Reduce prepressure to 1 bar
204
CO
2
measuring cell faulty
Sensor circuit open/shorted Contact Service
206 No CO
2
supply Both CO
2
cylinders empty Replace one or both CO
2
cylinders
207 CO
2
gas monitor failure
CO
2
gas monitor faulty or not
connected
Check connection of CO
2
gas monitor at
gas cylinders, contact Service as required
Act. val. < nom. val. –1 %
• No CO
2
• Prepressure low
• Supply line blocked
Check gas supply:
• Connect new gas cylinder
• Raise prepressure to 1 bar
• Check supply line to device
CO
2
below nominal value
200