Specifications

11 Barnstead |Thermolyne • 800-553-0039
Troubleshooting
The Troubleshooting section is intended to aid in defining and correcting possible service problems.
When using the chart, select the problem category that resembles the malfunction; then proceed to the
possible causes category and take necessary corrective action.
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION
The power light does not illuminate. The furnace is not connected to
power supply.
ON and OFF power switch
defective.
Check furnace connection to power
source.
Replace power switch.
The furnace does not heat. No power.
Thermocouple is open or
thermocouple leads reversed.
“SnSr FAIL” will be displayed on
screen.
Controller malfunction. “EE FAIL”
will be displayed on screen.
Element burned out. “LP.Br” will be
displayed on screen.
Solid state relay defective.
Door switch malfunction.
Check power source and fuses or
breakers.
Replace thermocouple or check
thermocouple connections.
Verify and correct all parameters and
configuration values. If “EE FAIL”
persists, replace control.
Replace muffle (element).
Replace solid state relay.
Re-align or replace door switch.
Slow heatup. Low line voltage.
Heavy load in chamber.
Wrong heating element.
Wired improperly.
One side of element is burned out
on 120V or 100V unit.
Install line of sufficient size and
proper voltage. (Isolate furnace from
other electrical loads.)
Lighten load in chamber to allow
heat to circulate.
Install proper element.
Check wiring diagram for correct
wiring of your furnace.
Replace muffle (element).