Barnstead F62730 Operation Manual - page 38

38

PROBLEM

POSSIBLE CAUSES                         CORRECTIVE ACTION

Furnace doesn’t stop heating

Door switch is malfunctioning.

Re-align or replace door 

when the door is opened.

safety switch.

Mechanized relay is

Replace relay. 

malfunctioning.

Repeated element burnout.

Heating harmful materials.

Clean up spills in and on 

chamber. 

Ventilate chamber by leaving 

top vent slightly open when 

heating known harmful reagents.

Wrong element.

Install proper element.

Oxidized thermocouple.

Replace thermocouple.

Contamination present from

Clean and/or replace

previous burnout.

insulation material.

Wired improperly.

Check wiring diagram for correct 

wiring of your furnace.

Inaccurate temperature readout.

Oxidized or contaminated

Replace thermocouple.

thermocouple.

Poor thermocouple connection.

Tighten connections.

Solid state relay malfunction.

Replace solid state relay.

Improper loading procedures.

Use proper loading procedures.

Poor ventilation of base or

Clear area around furnace base 

cooling fan failed.

or replace cooling fan.

Control out of calibration.

Contact Barnstead International.

Thermocouple connections

Reconnect thermocouple 

reversed.

correctly.

P.I.D. values invalid.

Re-tune control.

Control malfunction.

Verify and correct all parameter 

and configuration values. 

If malfunction persists, replace 

control.

T

ROUBLESHOOTING