Labnet 611D Laboratory Incubators - Manual (Page 14)

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1/ Safety set too low – see section 7.5.
2/ Controller set too low – see section 7.3.
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 – Call Customer Service
6/ Controller failure – confirm with front panel lights
that controller is calling for heat.
7/ Safety failure – confirm with front panel lights that
Safety is operating correctly.
8/ Wiring problem – Call Customer Service
9/ Loose connection – call Customer Service.
Temp-5 Display reads "LO"
1/ If ambient temperature is lower than range of unit –
compare set points and ambient temperature to rated
specifications
2/ Sensor is plugged in backwards – call Customer
Service.
Temp-6 Unit will not heat over
a temperature that is
below set point
1/ Confirm that fan is moving
2/ Confirm that set point is set high enough
Temp-7 Unit will not heat up at
all
1/ Do all controller functions work?
2/ Is the Safety set high enough? – for diagnostics,
should be fully clockwise with the pilot light never on.
3/ Has the fuse/circuit breaker blown?
Temp-8 Indicated chamber
temperature unstable
1/ Is fan working? – remove control side body panel
and verify movement of cooling fan.
2/ Is ambient radically changing – either door opening
or room airflow from heaters or air conditioning ? –
stabilize ambient conditions.
3/ Sensor miss-located, damaged or wires may be
damaged - check mounts for control and Safety
sensors, then trace wires or tubing between sensors
and controls.
4/ Calibration sensitivity – call Customer Service.
5/ Safety set too low – be sure that its setting is more
than 5 degrees over desired set point; check if pilot
light is on continuously; turn controller knob
completely clockwise to see if problem solved then
follow instructions in section 7.5 for correct setting.
6/ Electrical noise – remove nearby sources of RFI