Finish Thompson BE-15/15C - Manual (Page 13)

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If the LED on the Level Control Board still does not light, place a jumper wire between wire #21 and wire
#22 on the Level Control Board. If the LED lights, then replace wire #21 from the Level Control Board
to the Level Probe. If the LED does not light, the board is defective and must be replaced.
Possible Cause 3: Safety overtemp sensor(s) activated.
Disconnect electrical power to the BE unit before performing tests
on the Temperature Actuated Switches.
Check TAS2. This is a “normally closed” switch threaded into the front of the Process Tank behind the
access panel in the insulation. It is a 1/2” diameter white ceramic sensor with a brass hex base and two wires
(#1L1 and #25 for units K91 or newer, #11 and #12 for E91 or older) connected to it.
 If there is continuity between the two terminals of TAS2, proceed to “Check TAS4”.
 If there is not continuity between the two terminals of TAS2, the sensor has tripped.
Remove the switch and attempt to reset. Take care not to twist off its stud or to drop the sensor.
Units J92 and earlier had a switch rated for 410
F. This will be indicated by “L410” written on the
sensor. This sensor should reset at 32
F (place it in the freezer for a while). If the sensor will not reset,
then replace TAS2 with the latest version (385
F).
Units K92 and newer use a switch rated for 385
F. This will be indicated by “L385” written on the
sensor. This sensor should reset at 285
F. If the Process Tank is cool, and this sensor has not reset, then
replace TAS2.
If TAS2 has tripped, this indicates that the Process Tank is overheating. This can occur if there is a
residue build-up in the tank, or the Level Control System does not turn off the unit with 3 1/2 gallons of
liquid left in the Process Tank. Perform a “detergent flush” and check the Level Control System.
Check TAS4 (units J91 or newer). This is a “normally closed” switch threaded into the Distillate Piping
between the Condenser and Divert Solenoid Valve. It is a 1/2” diameter white ceramic sensor with a brass
hex base and two wires (#10 and #25) connected to it (it may be covered with a black plastic sheath).
 If there is continuity between the two terminals of TAS4, proceed to Possible Cause 4 & 5.
 If there is not continuity between the two terminals of TAS4, the sensor has tripped.
Remove the switch and attempt to reset. Take care not to twist off its stud or to drop the sensor.
TAS4 is a switch rated for 150
F. This will be indicated by “L150” written on the sensor. This sensor
should reset at 100
F. If the piping is cool, and this sensor has not reset, then replace TAS4 with the
latest version (180
F).
If TAS4 has tripped, this indicates that the Distillate Piping has overheated. This can occur if the
operator attempts to fill the Process Tank when the BE unit is still hot. The uncooled steam created can
trip TAS4 and prevent the unit from turning on. If the unit is cool, TAS4 should have reset.
CAUTION: