Sentry Industries Sentry 2.0 - Manual (Page 22)

Chapter 7
Error Messages
■ Error messages are accompanied by an alarm.
■ Non-interrupting messages do not stop the firing. Ter-
minating error messages do.
■ FTC, FTH, LTdE, and HTdE error messages are based
upon the setting in the Temperature Deviation (TEdE)
option. See page 20.
For detailed diagnostics and maintenance, see “Sentry
Trouble Shooter,” a separate publication.
Non-Interrupting
Error Messages
Press ENTER to silence the alarm. (Do not press stop to
silence the alarm.) The error message will remain but the
kiln will continue firing.
FTC / Failed to Cool
■ During a cooling ramp, the kiln cannot cool as quickly as
programmed. The temperature is above the deviation
setting. (See Temperature Deviation, page 20.)
Program a slower cooling rate.
FTH / Failed to Heat
■ During a heating ramp, the kiln cannot heat as quickly as
programmed. The temperature is below the deviation
setting. (See Temperature Deviation, page 20.)
Check for worn or burned out elements, defective relays,
low voltage and defective thermocouple. Program a slower
rate.
LTdE / Low Temperature Deviation
■ During a ramp or a hold, the temperature is below the de-
viation setting.
Check for worn or burned out elements, defective relays,
low voltage and defective thermocouple.
PF / Power Failure
PF alternating with normal display means the power
failed during firing. After power was restored, the firing re-
sumed.
Terminating Error
Messages
BAdP / Bad Programming
This message appears when a Ramp-Hold firing has been
programmed with 0 rate in the first segment.
ETH / Electronics Too Hot
■ The circuit board temperature is above 185°F/85°C.
Open windows and use a fan to circulate air in the room
before firing the kiln or furnace. If you have more than one
kiln in the room, place them farther apart. Never allow the
firing room temperature to exceed 110°F/43°C. (Measure
room temperature three feet away from the kiln.)
FAIL / Thermocouple Failure
■ Defective Thermocouple
■ Disconnected Thermocouple Lead Wires
■ Defective Board
■ Electrical Noise
FTL / Firing Too Long
■ The temperature rise is less than 27°F/15°C per hour and
the firing time is four hours longer than the current seg-
ment was programmed to fire.
Check for worn or burned out elements, defective relays,
low voltage and defective thermocouple.
HTdE / High Temperature Deviation
■ During a ramp or a hold, the temperature is above the de-
viation setting.
Check for a stuck relay.
PF 2 / Power Failure
■ The power failed. The kiln temperature was below
212°F/100°C when the power came back on.
The kiln will not resume firing.
PF 3 / Power Failure
This message appears when two conditions are met:
1 The power failed during the final segment of a
Cone-Fire firing. Or, the power failed during the fi-
nal segment of a Ramp-Hold firing that included a
108°F/60°C rate in the final segment.
2 The temperature dropped 72°F/40°C while the
power was off.
The kiln will not resume firing.
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