Finish Thompson BE-15/15C - Manual (Page 22)

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PROBLEM: LESS THAN 3 1/2 GALLONS OF RESIDUE DRAINS AFTER PROCESSING.
Possible Cause 1: Clogged Drain Valve.
CAUTION:
Do not open the fill valve or drain valve during operation or while hot.
Allow a minimum of one-half to two hours for cooling before draining or refilling.
CAUTION:
Wear proper eye and skin protection when working with this equipment.
Check for Residue or debris blocking the Drain Valve. This can occur if there were solids or sediment
poured into the Fill Funnel with the waste coolant. This can also occur if Residue is processed more than
once, or if Residues are continuously remixed into the waste coolant in an attempt to reduce disposable
wastes.
1. Place a drain pan (capable of handling hot liquids) under the Drain Valve and open the valve.
2. Insert and rotate a stiff wire (like a coat hanger) into the Drain Valve to attempt to break the clog free.
Use extreme caution, the residues may break loose and rush out. It may be necessary to remove the Drain
Valve and insert the wire directly into the Process Tank.
3. Perform a “detergent flush” as outlined in the “Maintenance: Semi-annually” section of this manual.
Possible Cause 2: Level Control Probe shorted to ground.
Check the Level Control Probe and its wiring for shorts to ground. The probe is inserted into a pipe on the
left side of the Process Tank. Once 3 1/2 gallons of liquid is poured into the tank, it touched the Level Probe
and activates the Level Control Board. This is designed to prevent the unit from running without liquid in the
Process Tank.
 If the Level Control Board’s LED it is not lit, proceed to Possible Cause 3.
 If the Process Tank is empty, and the LED on the Level Control Board is lit, there is a short to ground
with the Level Probe or its wiring.
1. Remove the cover for the Level Control Probe located on the left side of the unit’s cabinet. The top of the
probe resembles a spark plug. There will be a white wire (#21) attached to the top of it.
2. Remove wire #21 from the probe and check the LED on the Level Control Board.
 If the LED stays lit, the wire is shorting to ground. A likely place is where the wire enters through
the cabinet. A rubber grommet is supposed to be protecting the wire. Look for cuts in the wire’s
insulation. It may be necessary to replace this wire if the location of the short cannot be determined.