Shellab SCO26H-2 - Manual (Page 12)

TROUBLESHOOTING and SERVICE
Always make a visual inspection of the unit and control console when troubleshooting. Look for loose or
disconnected wires which may be the source of the trouble.
The incubator is designed so that no internal electrical servicing should be required under normal conditions.
If electrical servicing is necessary, it should be performed by qualified service personnel. For information on
where to reach technical service please see the manual cover. FOR PERSONAL SAFETY, ALWAYS
DISCONNECT THE POWER BEFORE SERVICING.
TEMPERATURE
Temperature too high – display and
actual match
1/ controller set too high-see see section 6.3
2/ controller failed on
– call Customer Service
3/ wiring error – call Customer Service
4/ Peltier condensate collector failure
DISPLAY reads "HI" or "400"+
probe is unplugged, is broken or wire to sensor is broken – trace wire from
display to probe; move wire and watch display to see intermittent problems
Chamber temp goes way over set point
and then settles to set point
Recalibrate – see section 6.4
Temperature too low – display and
actual match
1/ high limit set too low – see section 6.5
2/ controller set too low – see section 6.3
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
5/ element failure
– see if heating light is on; compare current draw to data plate
6/ controller failure – confirm with front panel lights that controller is calling for
heat
7/ high limit failure
– confirm with front panel lights that Over Temp Limit is
operating correctly
8/ wiring problem
– check all functions and compare wiring to users manual -
especially around any areas recently worked on
9/ loose connection
– check shadow box for loose connections
Display reads "LO"
1/ sensor is plugged in backwards – reverse sensor wires to controller
2/ if ambient temperature is lower than range of unit – compare set points and
ambient temperature to rated specifications in users manual
Unit will not heat over some
temperature that is below set point
1/ confirm that fan is moving and that amperage and voltage match data plate –
check fan motor motion in shadow box and feel for air movement in chamber
2/ confirm that set point is set high enough
–turn Over Temp Limit Thermostat all
the way clockwise and see if heating light or safety light comes on
3/ check connections to sensor
4/ check calibration
– using independent thermometer, follow instructions in
section 6.4
Unit will not heat up at all
1/ verify that controller is asking for heat by looking for Heating light – if pilot light
is not on continuously, there is a problem with the controller
2/ check amperage
– amperage should be virtually at maximum rated (data
plate) amperage
3/ do all controller functions work?
Section
9