Troubleshooting - Barnstead FB1310M Operation And Repair Manual And Parts List

Troubleshooting

Problem
The furnace does not heat
(CYCLE light does not illuminate).
Power is not cut to heating elements
when the door is open.
Slow heatup.
Repeated element burnout.
Inaccurate temperature
readout.
18
Possible Causes
No power.
Defective electrical hookup.
Thermocouple has oxidized and
opened the circuit. (Open thermocouple
is indicated on the display as a
temperature of 0-5 degrees).
Fuse(s) blown
Controller malfunction.
Door switches malfunction.
Defective solid state relay.
Door switches are not functioning
Low line voltage.
Heavy load in chamber.
Wrong heating element.
Overheating furnace.
Heating harmful materials.
Contamination present from
pervious burnout.
Oxidized or contaminated
thermocouple.
Poor thermocouple connection.
Improper loading procedures.
Poor ventilation of base.
Thermocouple connections
reversed. (Indicated by
downscaling of temperature on
display.)
Controller malfunction.
Corrective Action
Check power source and fuses or
breakers.
Repair electrical hookup.
Replace thermocouple.
Replace fuse(s).
Replace controller.
Re-align or replace door safety switches.
Replace output relay.
Re-align or replace door switches.
Install line of sufficient size and proper
voltage. (Isolate furnace from other
electrical loads.)
Lighten load in chamber.
Install proper element.
Keep furnace under maximum
temperature.
Enclose material in container. Clean up
spills in and on chamber. Ventilate
chamber by opening door slightly when
heating known harmful reagents.
Replace insulation material.
Replace thermocouple.
Tighten connections.
Use proper loading procedures.
Clear area around furnace base.
Reconnect thermocouple correctly.
Replace controller.