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TROUBLESHOOTING
TROUBLESHOOTING
Before determining any specific cause of a breakdown or abnormal operation of your dishwasher,
check that:
1. Turn all switches ON, except for the extended wash switch.
2. Wash arms are clean.
3. Scrap screen is properly positioned and clean.
4. Thermostat(s) are at their correct setting.
5. Sanitizer, detergent, and rinse additive dispensers are adequately filled.
6. All plumbing valves are open.
If a problem still exists, use the following table for troubleshooting.
CONDITION CAUSE SOLUTION
Machine will not start Door not closed and latched................ Make sure door is fully latched
Main switch off, or unit unplugged .... Check disconnect or plug into outlet
Make sure the extended wash switch is in
the OFF position.
Low or no water Main water supply is turned off ......... Turn on house water supply
Chemical not feeding No chemical in container..................... Replace or fill container
Feed tubes to/from chemical ............... Clear obstruction and flush
pump clogged with hot water
Screen on feed tube clogged................ Clean and replace
Tubing kinked or split ......................... Straighten or replace tubing
Water temperature Incoming water temperature................ Raise temperature to
is low when in use at machine too low 60°C/140°F for all machines
Hi limit tripped Reset hi limit
Insufficient pumped spray Clogged spray arm .............................. Clean
pressure Scrap screen full.................................. Must be kept clean and in place
Low final rinse temperature Low incoming water............................ Check the booster - be sure the
temperature thermostat is set to maintain 66°C/180°F
temperature (501LT is 60°C/140°F)
(Check all valves to be
sure they are clean and operating)
Hi limit tripped Reset hi limit
Poor washing results Water level low in wash tank .............. Check fill valve and water pressure
should be at or 1/2" (13mm)
above screen
Detergent dispenser not....................... Contact service agent
operating properly
Insufficient detergents......................... Check and fill
Contact detergent supplier
Detergent setting too low ................... Contact detergent supplier
Wash water temperature too low......... See above booster temperatures
Wash arm clogged .............................. Clean wash arm
Improperly scraped dishes................... Check scraping procedures
Ware being improperly........................ Use proper racks - do not overload
placed in rack racks
Improperly cleaned ............................. Unclog wash arms to maintain
equipment proper pressure and flow conditions
Electric element has ............................ Clean and delime
soil/lime buildup