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Door switch does
Door switch not functioning.
Realign or replace door safety
not cut power to
switch.
heating elements.
Controller over-temp.
Alarm output device malfunction. Replace controller.
does not cut power
to furnace chamber.
OTP relay malfunction.
Replace relay.
Element shorted to ground.
Replace faulty element.
Slow heatup.
Low line voltage.
Install line of sufficient size
and voltage (isolate furnace
from other electrical loads).
Heavy load in chamber.
Lighten load in chamber to
allow heat to circulate.
Wrong heating element.
Install proper element.
Heating element burned
Replace element.
out.
Repeated element
Overheating furnace.
Keep furnace under maximum
burnout.
temperature. Closer supervi-
sion of control setting.
Heating harmful materials.
Enclose material in container.
Clean up spills in and on
chamber. Ventilate chamber by
leaving top vent slightly open
when heating known harmful
reagents.
Contamination from previous
Replace insulation material.
burnout.
T
ROUBLESHOOTING
