Bunn JDF-4S service manual TROUBLESHOOTING cont PROBLEM Refrigeration, Probable Cause, Remedy

Models: JDF-4S

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TROUBLESHOOTING (cont.)

PROBLEM

Refrigeration

Dispense stations not working. Note: Cooling failure or excessive bath and cabinet temperatures for more than 4 hours will result in dispense lockout or no dispense.

PROBABLE CAUSE

1.Compressor ON/OFF switch.

2.Dirty condenser filter or fins.

REMEDY

Check for "ON" position or no con- tinuity - replace switch.

Clean filter and fins or replace con- denser filter. (Filter not supplied on some machines).

3.Condenser fan not running.

4.Compressor relay not activat- ing.

A)Check for 120V or 230V AC. Re- place fan motor or check fan blades for obstructions.

B)Check compressor LED on circuit board. If ON, relay coil should have power (120 or 230 VAC).

Check compressor relay coil for 120 or 230vac.

NOTE: Always check power with coil attached. If compressor LED is ON and no 120 or 230vac - re- place board. If yes, 120 or 230vac - replace relay.

Note: Relay contacts are normally open.

5. Compressor not running.

Check compressor thermal overload

 

(N/C). If open check for dirty con-

 

denser filter or adequate ventilation

 

and space around machine.

Dispenser Locked Out Dispense stations not working.

Cooling system failure.

6.Compressor running and not cooling.

1. Check Dispense Lockout switch.

1.Refrigeration or cold water recir- culation system.

Check refrigeration system for leaks and proper charge.

(A)Set switch to ON position.

(B)Check switch and harness for proper continuity.

Check all previous items that pre- tain to refrigeration or cold water recirculation

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44744 032811

 

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Bunn JDF-4S service manual TROUBLESHOOTING cont PROBLEM Refrigeration, Probable Cause, Remedy