*The ambient temperature is outside the
specified limits.
-The system is rated to function properly in
environments greater than 0Cº and less
than 40Cº
*The 24VAC to the print head is absent.
-Measure the 24VAC at X1 on the print
head PCA. If it is missing, suspect a blown
fuse in the Controller. Note that the AC
voltage reading at the print head end of the
print head power cable could measure up
to 10 VAC even though the fuse is blown.
This is due to a capacitive effect of the
cable
*The temperature setting was just
changed to a much lower temperature.
-Sometimes when lowering the
temperature setting significantly, especially
in a hot environment, the system cannot
cool down fast enough. This should be a
one-time fault so simply clear it and wait
for the system to reach the lower
temperature
*The electronic driver for the heater has
failed to a shorted state causing the
heater to be on continuously.
Check for AC voltage at X1 on the print
head PCA. If the diagnostic value for this
heater states it should be off yet there is
24VAC applied to the heater, replace the
PCA
*The electronic driver for the heater has
failed to an open state causing the
heater to be off continuously.
Check for AC voltage at X1 on the print
head PCA. If the diagnostic value for this
heater states it should be on yet there is no
24VAC applied to the heater, replace the
PCA
* The temperature sensor is defective or
not mounted properly. -Measure the
resistance of the sensor when it is
disconnected from the PCA. Reference the
resistance table in the Electronics section
to determine if its resistance is reasonable.
Ensure the sensor is properly mounted