Finish Thompson BE-15/15C - Manual (Page 25)

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PROBLEM: UNIT RUNS LONGER THAN 24 HOURS WITH NOTHING OR LITTLE PRODUCED.
Electrical shock hazard present.
Electrical servicing should be performed by a qualified electrician.
Possible Cause 1: Contactor not engaging or defective.
Determine whether the Heater Band’s Contactor has engaged. While the BE unit is turned on, check for
voltage to the Contactor’s coil (wires #13 and #18). If there is proper voltage between these two wire and the
contactor has not engaged, the Contactor should be replaced.
 For units E92 and older, there are two Contactors. The Heater Band’s Contactor is the upper-left
component in the circuit box inside the unit. The coil is rated for 120 volts.
 For units F92 or newer, there is only one Contactor for all motors and the Heater Band. Its coil is rated
for 240 volts. Hint: If the fan and pump motors are not running, the Contactor has not engaged.
Possible Cause 2 & 3: Loose/shorted wire or Heater Band failure.
Make sure the Heater Band’s wires are secured to the Heater Band’s Contactor. Also determine whether
there is proper resistance between the Heater Band’s terminals.
Disconnect electrical power to the BE unit before performing tests
on the Heater Band.
Locate wires #6 and #7 from the Heater Band’s Contactor and measure the resistance between them. There
should be 19
 of resistance through the Heater Band. Also check each wire (#6 and #7) for continuity to
ground. There should not be any continuity to ground.
If there is not 19
, or is continuity to ground, the Heater band is defective and must be replaced.
This can be verified by checking the wires attached to the Heater Band for possible shorts. The Terminals for
the Heater Band are located on the rear bottom of the Process Tank under the insulation. Refer to the
“Service Procedures: Heater Band Replacement” section of this manual for further details.
WARNING:
CAUTION: