Rinse pressure too low; display shows E13 and machine may not allow sanitizing cycle to continue.

Safety first: Turn off power and close the rinse water supply before disassembling any plumbing components.

Step-by-step checks:

• Verify building pressure: Use a gauge to confirm that incoming water pressure meets CMA’s minimum requirement for the model.
• Check supply valves: Ensure all valves feeding the dishmachine and booster are fully open.
• Clean rinse strainer and regulator: Locate the rinse line strainer and pressure regulator. Remove and clean the strainer screen. Inspect the regulator for debris or scale; clean or replace if it cannot maintain pressure.
• Inspect rinse pressure switch: If equipped, test the rinse pressure switch for proper operation with a meter and replace if it does not change state at the specified pressure.

When to call a technician: If building pressure is adequate but the machine still reports low rinse pressure, a technician should evaluate the regulator, booster, and internal plumbing.