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9
Sentry Express Digital Temperature Controller
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Error Messages
bAdP/Bad Programming
The kiln will not fire because the program just entered
has a rate of 0000 in segment 1. Program the firing
again.
EtH/Electronics Too Hot
The temperature of the electronic circuit board is
above 158°F/70°C. This could damage the controller, so
the firing has been stopped. To prevent this, keep the
firing room cooler. Use better ventilation.
FaIL/Thermocouple Failure
The thermocouple, or temperature sensor, failed dur-
ing firing. Causes:
Defective thermocouple or disconnected/loose wires
Defective controller
Electrical noise
Thermocouple Paperclip Test
Check the thermocouple
wire connection. (See your
kiln instruction manual.) If
connections are tight, per-
form this test:
1. UNPLUG the kiln or dis-
connect the power.
Remove the controller. Remove the two thermo-
couple wires from the back of the controller.
2. Cut a thin paperclip in half. Insert a U-shaped paper-
clip piece, or other piece of thin wire, where you
removed the thermocouple wires.
3. Plug in the kiln. If the controller displays room tem-
perature, replace the thermocouple. If it shows
FaIL
,
replace the controller.
TCR/Thermocouple Reversed
Thermocouple lead wire are reversed.
FtL/Firing Too Long
This message appears when both of the following
conditions are met:
The temperature rise or fall is less than 27°F/15°C per
hour.
The firing is 4 hours longer than programmed.
See “Controller display turn on. No heat in kiln,” page 11.
PF 1/Power Failure
The power failed during firing and temperature
dropped more than 180°F/100°C by the time the power
cam back on.
PF 2/Power Failure
The power failed during firing and kiln temperature
was below 212°F/100°C when the power came back on.
tC/Thermocouple Failure
The thermocouple failed or was disconnected during
the
IdLE
display. See “FaIL” in the column at left.
Selecting
°
F or
°
C Display
The controller can display temperature in either °F or
°C. If your controller shows a small display dot in the
lower right corner of the display, the temperature
shown is °C. No dot means °F. To change temperature
display:
1. UNPLUG kiln or disconnect power.
2. Remove the four screws that hold the controller to
the front kiln. Carefully remove the controller from
the kiln. Leave the wire attached to the controller.
3. Look at the back of the controller. A plastic jumper
on the back of the board determines the type of
temperature display. When the jumper connects
two pin-type terminals, display reads °F. When the
jumper is removed, display reads °C. Remove or
insert the jumper as desired. (You can purchase the
jumper from a computer supply store if necessary.)
4. Install the controller being careful not to jar compo-
nents on the back of the controller against the kiln
case.
