12
1/ sensor is plugged in backwards – reverse sensor
wires to controller
2/ if ambient temperature is lower than range of unit
– compare set points and ambient temperature to
rated specifications in section 7, Unit Specifications.
Unit will not heat over a
temperature that is below set
point
1/ confirm that fan is moving and that amperage and
voltage match data plate – check fan motion, feel for
air movement in chamber
2/ confirm that set point is set high enough –turn
safety all the way clockwise and see if heating light
or safety light comes on
3/ check connections to sensor
4/ check calibration – using independent certified
thermometer, follow instructions in section 4.5
Unit will not heat up at all
1/ verify that controller is asking for heat by looking
for controller light – if pilot light is not on continuously
during initial start-up, there is a problem with the
controller.
2/ check amperage – amperage should be virtually
at maximum rated (data plate) amperage.
3/ do all controller functions work?
4/ is the Safety set high enough? – for diagnostics,
should be fully clockwise with the pilot light never on.
5/ has the fuse/circuit breaker blown?
Indicated chamber temperature
unstable
1/ ±0.1 may be normal
2/ is fan working? – feel for air movement at the top
of the chamber.
3/ is ambient room temperature radically changing –
either door opening or room airflow from heaters or
air conditioning ? – stabilize ambient conditions.
4/ 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.
5/ calibration sensitivity – call Customer Service
6/ high limit set too low – be sure that Safety is more
than 5 degrees over desired set point; check if High
Limit pilot is on continuously; turn controller knob
completely clockwise to see if problem solved then
follow instructions in owner’s manual for correct
setting – see section 4.6
7/ electrical noise – remove nearby sources of RFI
including motors, arcing relays or radio transmitters.
8/ bad connection on temperature sensor or faulty
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