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If the ST535 detects a problem the buzzer will sound and an error message will be
displayed. This error message will alternate with a display of kiln temperature. The
segment number display will show where the error occurred.
To obtain more information on the error operate the ◄ key. The first press will display
the maximum temperature reached in the firing. The second press will display the
length of time that the error has been present. The buzzer will mute.
ERROR: 1
Possible causes: kiln door or lid not closed properly or door switch faulty or needs
adjusting. Heater element open circuit or elements too old. Electrical power phase
failure or contactor failure.
ERROR: 2
ERROR: 3
ERROR: 4
Possible causes: contactor failure (contacts welded?) or thermocouple connection
intermittent or high resistance.
ERROR: 5
ERROR: 6
ERROR: 7
Possible causes: kiln room vent fan failure, kiln room too small, ventilation grills
blocked, damper or bung left open, controller mounted too close to kiln.
ST535 User Handbook
Error Messages
Heating error. The kiln temperature is not in-
creasing as required. The kiln has been on full
power for 1 hour but the temperature has not
increased by at least 8°C.
Thermocouple or thermocouple wiring open
circuit. Get thermocouple and wiring checked.
Replace thermocouple if necessary.
Thermocouple reversed (kiln temperature appar-
ently less than -40°C). This is an installation
fault. Get wiring checked.
Cooling error. The kiln has been on zero power
for 30 minutes but the kiln temperature has not
fallen by at least 1°C.
Kiln temperature overshoot. The kiln tempera-
ture exceeds the desired temperature by a pre-
set limit.
Maximum firing time exceeded. The length of
the firing has exceeded an installer selectable
limit.
Maximum room temperature exceeded. The
internal temperature of the ST535 has exceeded
an installer selectable limit.
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