Section 7 Troubleshooting (continued)
Page 7-2
TEMPERATURE
Temperature too high
1/ controller set too high-see Operation section
2/ controller failed on
– call Technical Services
Temperature too low
1/ Over Temperature Limit Thermostat set too low
– see Operation Section
2/ controller set too low
– see Operation section
3/ unit not recovered from door opening
4/ unit not recovered from power failure or being turned
5/ controller failure
– confirm with front panel lights that controller is operational.
6/ Over Temperature Limit Thermostat failure
– confirm with front panel lights that thermostat is
operating correctly.
Unit will not heat over a temperature that
is below set point
1/ confirm that fan is moving
– check fan motor motion in shadow box, feel for air movement in
chamber
2/ confirm that set point is set high enough
–turn Over Temperature Limit Thermostat all the way
clockwise and see if TEC Activated light or OVER TEMP light comes on
3/ check calibration
– using independent certified thermometer, see Operation section
Unit will not heat/cool at all
1/ verify that controller is asking for heat/cool by looking for controller light. Output 1 should be on
for heat; output 2 should be on for cooling.
2/ do all controller functions work?
Indicated chamber temperature unstable
1/ ±0.1 may be normal
2/ Are the internal and external fans working?
3/ Is ambient room temperature rapidly changing
– either door opening or room airflow from
heaters or air conditioning?
– stabilize ambient conditions.
4/ Over Temperature Limit. Thermostat set too low
– thermostat must be set at least one degree
over the desired main set point; see if OVER TEMPERATURE pilot is on continuously; turn controller
knob completely clockwise to see if problem solved, then see Operation section for correct setting
5/ electrical noise-remove nearby sources of RFI including motors, arcing relays, radio transmitters.
Display and reference thermometer don
’t
match
1/ calibration error
– see Operation Section
2/ allow at least two hours to stabilize
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 as possible.
MECHANICAL
Motor makes noise
Ensure fan is not making contact with foreign material
Door not sealing
Confirm unit has not been damaged and unit is square. Check gasket condition.
If none of the suggestions listed above in the Troubleshooting guide have solved the problem Technical Services should
be contacted for assistance. Have the model number, serial number and voltage (listed on the date plate on the side of
the incubator) as your service representative will require it.
