Rinse boiler does not reach temperature; machine may not allow final rinse and displays E5.

Safety first: Isolate power and allow the machine to cool. The boiler area can be extremely hot and under pressure.

• Check high-limit thermostat: Locate the manual reset safety thermostat on the boiler body. Press the reset button if present. If it trips repeatedly, investigate overheating causes.
• Inspect wiring and contactor: Open the electrical panel and check the boiler contactor/relay and wiring for signs of burning or loose connections. Tighten terminals as needed.
• Test boiler element: With power off and wires removed, measure resistance across the boiler heater terminals. An open circuit indicates a failed element that must be replaced.
• Check boiler NTC/thermostat: Inspect the temperature probe for scale buildup. Clean gently and test resistance against Comenda specifications. Replace if readings are out of range or intermittent.
• Verify supply voltage: Ensure the correct three-phase or single-phase supply is present at the boiler contactor when heating is requested.

Due to high power and pressure, boiler repairs are best handled by a qualified technician.