42
P
ROBLEM
S
OLVING
Problem
Probable Causes
Corrective Action
Slow heatup.
Low line voltage.
Install line of sufficient size
and proper 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.
One or more heating
Replace burned out elements.
elements are burned out.
Wired improperly.
Check wiring diagram for
correct wiring of your furnace.
Door switch does not cut
Door switch is not functioning.
Realign door strike or
power to the furnace chamber.
replace door safety switch.
Safety relay malfunction.
Replace safety relay.
Repeated element burnout.
Overheating furnace.
Do not exceed the maximum
operating temperature of
furnace or recommended
continuous intermittent use
values.
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.
