14
to schematics in section 8.0 - especially around any areas
recently worked on.
9/ Loose connection – check shadow box for loose
connections.
Display reads "LO"
1/ If ambient temperature is lower than range of unit –
compare set points and ambient temperature to rated
specifications in section 8.0.
2/ Sensor is plugged in backwards – reverse sensor wires
to controller.
Unit will not heat over a
temperature that is below set
point
1/ Confirm that set point is set high enough –turn
Thermostat all the way clockwise and see if HEATING light
or OVER TEMP light comes on.
2/ Check connections to sensor.
3/ Check calibration – using independent thermometer,
follow instructions in section 5.6
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 Overtemperature 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 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 Thermostat
sensors, then trace wires or tubing between sensors and
controls.
4/ Calibration sensitivity – call Customer Service.
5/ Overtemperature 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 5.7. for correct setting.
6/ Electrical noise – remove nearby sources of RFI
including motors, arcing relays or radio transmitters.
7/ Bad connection on temperature sensor or faulty sensor
– check connectors for continuity and mechanical
soundness while watching display for erratic behavior;
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