Shellab SCO12WE-2 - Manual (Page 19)

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Display and reference thermometer
don’t match
1/ calibration error – see section 5.4
2/ temperature sensor failure – evaluate if pilot light is operating
correctly
3/ controller failure
– evaluate if pilot light is operating correctly
4/ allow at least two hours to stabilize
5/ verify that reference thermometer is certified
Can't adjust set points or calibration
1/ turn entire unit off and on to reset
2/ if repeatedly happens, call Customer Service
Calibrated at one temperature, but not
at another
This can be a normal condition when operating temperature
varies widely. For maximum accuracy, calibration should be done
at or as close to the set point temperature.
CO2 LEVEL
Overshoots set point but stabilizes -
display and Fyrite match
1/ turn set point up and down to see if solenoid valve works by
feeling and listening to valve
2/ recalibrate with Fyrite
3/ fan not operating correctly
a- fan motor stopped
b- fan blade fell off
c- wrong fan blade installed or mounted backwards
4/ wrong restrictor installed or missing altogether
5/ tank pressure too high, see section 5.9.A
6/ CO2 sensor partially plugged with dirt or condensation
7/ regulator set wrong, see section 5.9
8/ incubator too heavily loaded
9/ incubator being operated without shelving
10/ CO2 attached to sample port instead of “CO2 IN” fitting
11/ if display and Fyrite does not match, see below
Overshoots set point and continues to
rise - display and Fyrite match
1/ debris in solenoid causing it to leak continuously
2/ solenoid failed while open
3/ unit miss wired
4/ controller output failed or shorted
5/ CO2 sensor or interface failure
6/ CO2 sensor plugged by debris or condensation
Rises very slowly
1/ restrictor partially plugged
2/ filter overly dirty or partially plugged
3/ CO2 tank regulator set too low, see section 5.9
4/ hose kinked or leaking
5/ poor door seal
6/ CO2 tank contains mixed gas, not 100% medical grade CO2