Chapter 7
Error Messages
■Error messages are accompanied by an alarm.
■
■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
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:
1The power failed during the final segment of a
2The temperature dropped 72°F/40°C while the power was off.
The kiln will not resume firing.
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