Display shows E11; unit may heat briefly then shut down.

Safety: A ground fault can be dangerous. Turn OFF power immediately and do not operate the unit until the fault is corrected.

• Inspect for moisture: Remove the cover and look for water leaks or condensation near electrical components. Repair any plumbing leaks and dry the area thoroughly.
• Check wiring: Look for wires with damaged insulation touching the metal chassis. Repair or replace any compromised conductors.
• Test heating elements: With a multimeter on resistance, disconnect each element and measure from each terminal to the metal sheath or ground. Any measurable continuity indicates a ground leak; replace that element.
• Reassemble and test: After correcting issues, restore power and run hot water. If E11 persists, the ground fault detection circuit on the control board may be faulty.
• Professional service recommended: Persistent ground fault codes should be evaluated by a qualified technician to ensure safe operation.