Final rinse temperature sensor error; display shows E5 and machine may lock out sanitizing cycles.

Safety first: Disconnect power to the dishmachine. Allow the booster and rinse lines to cool before touching any components.

Step-by-step checks:

• Inspect probe location: Locate the final rinse temperature probe (often mounted in the rinse line or booster outlet). Ensure it is properly seated and not coated with heavy scale.
• Check wiring: Follow the probe wiring back to the control board. Look for loose connectors, broken insulation, or corrosion. Reseat all connectors firmly.
• Test probe resistance: With the probe disconnected, measure its resistance at room temperature and compare to CMA’s specification. An open or shorted reading indicates a failed probe.
• Control board input: If the probe tests good but E5 persists, the temperature input circuit on the control board may be defective and require replacement.

When to call a technician: If you are unable to access or test the probe safely, or if a control board replacement is needed, contact a CMA-authorized service provider.