Safety first: Use chemical PPE when working with rinse aids or sanitizers. Some sanitizers are corrosive.

Verify chemical supply: Ensure the rinse aid or sanitizer jug is not empty and that the suction tube filter is not clogged.
Inspect injection point: Locate the injection fitting on the rinse line or tank. Remove and clean any crystallized chemical or debris blocking flow.
Check pump operation: Activate the pump’s prime function if available. Observe whether chemical is drawn and discharged. If the pump motor does not run, test for voltage at the pump terminals during dosing.
Replace pump tubing or head: For peristaltic pumps, replace flattened or chemically attacked tubing and worn rollers.
Verify wiring and polarity: Ensure the pump is wired to the correct output terminals on the control board and that any polarity requirements are met.

After repair, recalibrate the dosing rate to meet Jackson’s and local health code requirements for sanitizer concentration.

Jackson dishwasher displays E12 indicating a rinse aid or sanitizer dosing fault.

Possible Causes