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6-14
2000-OSM, F1
Any one of the following alarm messages or conditions could be present:
On Background Screen
***ALARM:*** (flashing)
On Manual Temperature
Zone (#) (flashing)
Control Mode Screen
*Temp Bd Alarm* (flashing)
On
Alarm
Screen
Temperature
Board:
*Zone
Specific
*Analysis
Shutdown
***
TEMP
ZONE
(#)
Alarm
***
*Overtemp
*Reasonableness
Test
*Probe
Open/Shorted
or
TC
Faulty
Failure: The failure is most likely isolated to the zone indicating a temperature greater than 500
degrees.
Cause: The sensor to the zone input for temperature monitoring has possibly opened, or is no longer
connected. Perform
Test Procedure 25
(Zone Input Sensor Open).
Loss of Air
Symptom: The isothermal oven (zone # 1) and programmed temperature oven (zone #2) are not
being heated. The actual temperature reduces and eventually approaches ambient. These are the
only temperature controllers that use air baths.
Any one of the following alarm messages or conditions could be present:
On Background Screen
***ALARM:*** (flashing)
On Manual Temperature
*Temp Bd Alarm* (flashing)
Control Mode Screen
On
Alarm
Screen
Temperature
Board:
*Loss of Air
Failure: Malfunction is related to application of oven air to air bath ovens. The air bath heater(s) will
overheat and burn out if air is not applied to the heaters while power is applied. The air provides the
heat to ovens by displacing heat from the heaters. The presence or lack of oven air is sensed by a
pressure switch. If air is removed, the switch opens and power is removed from the air bath heaters.
When air is applied the switch closes allowing the temperature controller to apply heat to the air bath
heaters.
Cause: The oven air has been shut off or reduced below air pressure switch setting. The oven loss
of air pressure switch has failed or connection problem exists. Perform
Test Procedure 23
(Loss of
Oven Air).
Triac Failure
Symptom: The Actual temperature is indicating below set point for zone and alarm is indicating triac
failure.
Any one of the following alarm messages or conditions could be present:
On Background Screen
***ALARM:*** (flashing)