Instruction manual

15
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