How to Fix / Troubleshooting

Safety first: Disconnect power and close water supply as needed. Beware of hot water in rinse lines.

Check building pressure: Measure water pressure at the rinse supply line. Insinger dishwashers typically require a minimum specified pressure; consult the installation manual.
Clean rinse arms and jets: Remove the upper and lower rinse arms. Soak in descaling solution if mineral deposits are present. Use a small brush or pick to clear each jet.
Inspect rinse valve and strainer: Shut off water, remove the rinse solenoid valve inlet fitting, and clean the internal strainer. Replace the valve if the internal mechanism is damaged or restricted.
Rinse booster pump (if present): Check the booster pump for proper operation, leaks, or cavitation. Ensure the pump is primed and not drawing air.
Re-test rinse: Restore water and power, then run a cycle to confirm strong, even rinse spray and that E12 does not return.

Low rinse pressure; final rinse appears weak or incomplete and E12 is shown.

Possible Causes