Shellab SRI3-2 - Manual (Page 9)

9
TROUBLESHOOTING
FOR PERSONAL SAFETY, ALWAYS DISCONNECT THE POWER BEFORE SERVICING.
In the event the incubator does not operate properly, check the following before calling for service.
Always make a visual inspection of the incubator and control console when troubleshooting to find loose
or disconnected wires which may be the source of trouble.
TEMPERATURE
Temperature too high
Controller set too high.
Display reads "HI"
Probe is unplugged, is broken or wire to sensor is broken.
Temperature too low
1/ Overtemperature thermostat set too low.
2/ Controller set too low.
3/ Unit not recovered from door opening
– wait for display to stop
changing.
4/ Unit not recovered from power failure or being turned off – incubators
will need 24 hours to warm up and stabilize.
Display reads "LO"
Sensor is shorted.
Unit will not heat up at all
1/ Verify that controller is asking for heat by looking for controller light
2/ Do all controller functions work?
3/ Is the Overtemperature set high enough?
Indicated chamber temperature unstable
1/ ±0.1 may be normal
2/ Is fan working?
3/ Is ambient room temperature radically changing
– either door opening
or room airflow from heaters or air conditioning ? – stabilize ambient
conditions
4/ Overtemperature set too low.
5/ Electrical noise
– remove nearby sources of RFI including motors,
arcing relays or radio transmitters
Display and ref erence thermometer don’t
match
Calibration error.
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 as close to the set
point temperature.
REFRIGERATION
Unit will not cool
If the compressor is running:
1/ See if condenser is cold but free of ice
2/ Be sure that fans are circulating air: in the chamber, and over
the compressor
Section
6