Finish Thompson BE-15/15C - Manual (Page 12)

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PROBLEM: UNIT WILL NOT TURN ON.
Possible Cause 1: No or Improper Electrical Power.
Electrical shock hazard present.
Electrical servicing should be performed by a qualified electrician.
Check main circuit breaker. If tripped, verify correct wiring and electrical supply to the BE unit.
 F92 and newer units require a 3-wire (L1, L2, and Ground) 240 VAC, single-phase electrical supply.
No neutral wire should be used or connected to the terminal strip in the BE’s circuit box.
 E92 or older units require a 4-wire (L1, L2, Neutral, and Ground) 240 VAC, single-phase electrical
supply. If a neutral wire is not available, connect the Ground to the “G” and the “N” position of the
terminal strip in the BE’s circuit box.
If the wiring to the unit is as above and correct, refer to the “Problem: Circuit breaker keeps tripping” in the
“Troubleshooting Tests and Repairs” section of this manual.
Possible Cause 2: Level control system not satisfied.
Verify that there is more than 3 1/2 gallons of liquid in the Process Tank. Verify by attempting to pour
additional coolant into the Process Tank.
Check the red LED on the Level Control Board (located in the lower right corner of the BE’s circuit box).
When liquid touches the Level Probe, it grounds the probe and lights the LED on the Level Control Board.
 If the LED is lit, proceed to Possible Cause 3.
 If the LED is not lit, and it is verified that there is more than 3 1/2 gallons of liquid in the Process
Tank, the unit is not sensing the liquid.
Check the Level Probe and its wiring. Touch the probe’s wire (#21) to the probe’s pipe. If the LED lights,
remove the probe and check for a clog in the pipe that would prevent liquid from reaching the probe.
Also check continuity between the probe’s wire terminal and the probe’s rod. If there is no continuity,
the Level Probe is defective and must be replaced.
If the LED still does not light, check the Process Tank’s ground wire connection. This wire is attached to
the Process Tank with a screw (behind the small access panel in the tank’s insulation). This connection
can become corroded and not allow the Level Control to function. Remove the screw, file the metal
clean, and re-attach the wire with a new screw and new crimp connector.
If the screw is too corroded to remove, drill and tap a new hole for the ground into the same metal slab,
next to the old screw.
Do not drill a hole into or through the Process Tank.
Drill into the welded metal slab only. Maximum drill depth is 1/4”.
WARNING:
CAUTION: