Common Commercial Dishwasher Faults and Fixes

Commercial dishwashers are essential in foodservice kitchens. After long use, small faults appear. CHINENG lists common problems and quick remedies.

Common commercial dishwasher faults

1. Ware not cleaned well

1. Check spray-arm installation

2. Clear clogged nozzles

3. Check for pump blockage

4. Confirm water pressure

5. Add enough detergent

6. Fully open electric heat or steam valves

2. Weak rinse force

1. Dirty tank filters reduce flow—shut water, clean, and refit filters

2. Low pump pressure or clogged nozzles

3. Machine will not run

1. Confirm power is on

2. Clear jammed conveyor tracks

3. Reset an accidental emergency stop

4. Check the control display for wrong settings

5. Replace blown fuses or tripped breakers

4. Tank not heating

1. Check water level

2. Confirm heater contactor is closed

3. Fully open the steam supply valve

5. Poor spray coverage

1. Misaligned spray arms

2. Blocked nozzles

6. Spots or watermarks

1. Ware stacked without separation

2. Water temperature too low

3. Clogged nozzles

4. Water too soft or too hard

5. Detergent mismatched to water quality

Small faults are normal. Knowing causes helps restore service quickly—via the manual or after-sales—without always waiting for a technician.

Choose reputable brands to reduce recurring issues. Follow CHINENG for more warewashing guidance.