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8-2.5 Defective Thermocouples
Some temperature controllers and excess temperature limit interlocks are
provided with thermocouples for sensing. Compare known reading at sensor
inside oven to controller display. If it varies grossly, sensor may have to be
replaced. If sensor is damaged or broken open, the controller display may give
thermocouple error codes (see controller manual for proper error code
meanings).
8-2.6 Improper Line Voltage
Voltage at the oven should be measured to determine if an excessive line drop
is causing reduced power input to the heating elements on an electrically
heated oven. This could be caused by too many devices connected to the
same circuit or by undersized wiring between the oven and the power source.
Measure the voltage with the oven heating elements on and all other
equipment on the same circuit operating.
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