Specifications

PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
No temperature control. Shorted thermocouple circuit. Check thermocouple connection
and/or replace thermocouple.
Shorted solid state relay - over Replace solid state relay.
temperature protection may
be activated.
Defective control - error message Return control for repair
on display may appear. or replace.
Thermocouple leads are reversed. Connect leads correctly (see manual).
Slow heat-up. One or two heating elements are Replace burned out elements.
burned out.
Heavy load in chamber. Lighten load in chamber
to allow heat to circulate.
Low line voltage. Install line of sufficient size and
proper voltage (isolate furnace
from other electrical loads).
Incorrect parameter setting “HL” Set “HL” to 100.
high power limit.
Wired improperly. Check wiring diagram for
correct wiring of your furnace.
Wrong heating element. Install proper element.
Door switch does not cut power Door switch is not functioning. Re-align or replace door safety
switch.
to the furnace chamber.
Mechanical relay contacts sticking. Replace relay.
Repeated element burnout. Chamber improperly loaded. See loading procedures in start-up
procedure.
Heating harmful materials. Enclose material in container.
Clean up spills on chamber.
Ventilate chamber by leaving door
cracked slightly open when
heating known harmful reagents.
Overheating furnace. Keep furnace under maximum
temperature. Closer supervision
of control setting.
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TROUBLESHOOTING