12 13
Problem Solution
Unit will not heat up at all 1) Verify that controller is asking for heat by looking
for heating indicator light – if pilot light is not
on continuously at initial start up, there is a
problem with the controller
2) Check amperage – amperage should be virtually
at maximum rated (data plate) amperage
3) Is the Thermostat set high enough? – for
diagnostics, should be fully clockwise with the
pilot light never on
4) Has the fuse/circuit breaker blown?
Chamber temperature 1) Is ambient room temperature radically changing
unstable; will not maintain – either door opening or room airflow from
set point heaters or air conditioning ? – stabilize
ambient conditions.
2) It may happen if exhaust stack is 100% open –
close exhaust stack.
3) Calibration sensitivity – call Customer Service
4) Thermostat set too low – be sure that it is more
than five degrees over desired set point; check
if pilot is on continuously; turn controller knob
completely clockwise to see if problem solved
then follow instructions in section 6.2 for
correct setting.
5) Assure that set point is at least 5 degrees over
ambient room temperature.
6) See if ambient is fluctuating
7) Verify that reference thermometer is certified.
Mechanical
8.2
Problem Solution
Door not sealing 1) Confirm that the door gasket is clean of debris
and aligned properly.
2) Confirm that unit has not been damaged and
that the body is square.
Other
8.3
Problem Solution
Unit or wall fuse/ 1) Check wall power source.
circuit breaker is blown 2) Compare current draw and compare to specs
on data plate.
3) See what other loads are on the wall circuit.
Unit will not turn on 1) Check wall power source.
2) Check fuse circuit breaker on unit or in wall.
3) Check all wiring connections,
esp. around the on/off switch.
Unit is smoking – Put unit under vent and run at full power for
out of box one hour
Contamination 1) See Cleaning procedure, section 3.5
in chamber 2) Develop and follow a standard operating
procedure for specific application; include
definition of cleaning technique and
maintenance schedule
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