Shel lab SMO5CR-2, Installation And Operational Manual, Page: 14 / 20

14
TROUBLESHOOTING
TEMPERATURE
Temperature too high
1/ controller set too high-see your Jumo users manual
2/ controller failed on
– call Customer Service
3/ wiring error
– call Customer Service
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 spikes over set point
and then settles to set point
Recalibrate
– see Jumo users manual
Temperature too low
1/ high limit set too low
– see section 4.5
2/ controller set too low
– see Jumo users manual
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
– call Customer Service
6/ controller failure
– confirm with front panel lights that controller is
calling for heat
7/ high limit failure
– confirm with front panel lights that High Limit is
operating correctly
8/ wiring problem
– check all functions and compare wiring to
owners 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
– call Customer Service
2/ if ambient room temperature is lower than range of unit
–
compare set points and ambient temperature to rated specifications
in Section 10.0
Unit will not heat over a temperature
that is below set point
1/ confirm that blower motor is moving and that amperage and
voltage match data plate
– check blower motor motion in shadow
box and feel for air movement in chamber
2/ confirm that set point is set high enough
–turn High Limit
clockwise and see if High Limit light comes on
3 / check connections to sensor
4/ check calibration
– using independent reference thermometer,
follow instructions in Jumo users manual
Section
9