– 16 –
TROUBLESHOOTING
Symptoms that persist after possible causes have been checked may require service.
SYMPTOMS POSSIBLE CAUSES
No Machine Operation 1. Machine
POWER
switch in the
OFF
position.
2. Blown fuse or tripped circuit breaker at power supply.
3.
DELIME/NORMAL
switch in the
DELIME
position and machine in the middle of
a cycle.
Continuous Machine 1.
DELIME/NORMAL
switch in
DELIME
position.
Operation 2. Problem with timer. Contact your local Hobart Service Office.
Dishes Not Clean 1. Pump intake strainer clogged causing inadequate water supply to pump.
2. Obstruction in wash arm nozzles or bearings preventing arms from turning.
Refer to C
LEANING THE DISHWASHER, page 12.
3. Wash arms improperly assembled. Make sure end caps are assembled and the
knurled disks on the wash / rinse arm hubs are secure.
4. Inadequate fill due to low supply water pressure and / or improper cycle timer
adjustment.
5. Water temperature too low (140°F recommended, 120°F minimum).
6. Improper water hardness (4 – 6 grains/gallon is recommended).
7. Excessive lime deposits throughout wash/rinse system.
8. Dirty line strainer (see Fig. 6) causing reduced water flow. Turn off water supply,
remove strainer cap, withdraw and clean screen, and reassemble.
9. Incorrect type or concentration of detergent.
10. Check to make sure chemical supply hoses are in the their proper container:
Red in detergent, blue in rinse aid, white in sanitizer. Also, check the standpipes
to make sure they extend to the bottom of the container.
11. Wash tube disconnected from manifold or O-ring leaking, resulting in low water
pressure to upper arm.
12. Wash arm bearings (Fig. 22) damaged or excessively worn, preventing free
rotation of the wash arm. To change the wash arm bearing assembly, unscrew
bearing assembly from wash/rinse arm and replace with a new bearing assembly.
13. Check for empty chemical containers.
Spotting of Silverware, 1. Improperly loaded racks.
Glasses, or Dishes 2. Water temperature too low (140°F recommended, 120°F minimum).
3. Improper water hardness (4 – 6 grains/gallon is recommended).
4. Improper concentration of detergent, rinse aid, and/or sanitizer.
Fig. 22
FORM 18580 REV. A (8-96) PRINTED IN U.S.A.
PL-40935-1
WASH ARM BEARING
(20 pages)
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