hace 13 años
E13, Heater Not Switching Off
The microcontroller has commanded the heater to switch off (Heat TP1-17 high).
However, the heater status signal from U23 pin 8 remains high indicating that the
heater is on.
This error code can be triggered without an actual failure having occurred, because
of a thermal switch in the heater neutral that opens at a temperature of 76.7°C.
When the thermal switch opens, it causes a logic high heater status signal, which
illuminates the heater status LED and signals the microprocessor that the heater is
on.
The thermal switch normally opens for a few minutes when a hot incubator is
switched off because of residual radiant heat and the lack of a cooling air flow. If
the incubator is restarted before the thermal switch has cooled, E13 may appear as
soon as this alarm is enabled (approximately three and a half minutes after power
up; normally, a period of three and a half minutes is sufficient to cool the incubator).
Check to see if the thermal switch has opened as soon as the error occurs, before
it has had time to cool down. The thermal switch opens at a temperature of 76.7°C
and is located on the back of the controller. Because the decimal point is not
illuminated, you must divide the reading by 10 to obtain the temperature.
The second possibility is that the thermal switch has failed in an open position.
Disconnect the power cord and do a continuity check between the two terminals of
the thermal switch. The resistance should be less than 1 Ohm.
The third possibility is a shorted solid state relay. Replace the relay. If the problem
persists, replace the control board.
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