Steam pressure too high; safety valve hisses or releases steam frequently.

Safety first: If the safety valve is venting continuously, switch OFF and unplug immediately. Do not block the safety valve.

• Allow to cool: Let the machine cool and depressurize fully before opening any panels.
• Check settings: On PID-controlled models, verify the steam temperature/pressure setting in the menu. Reset to factory defaults if unsure.
• Inspect pressurestat (if fitted): On mechanical-pressurestat models, ensure the pressurestat is not physically damaged or flooded with water. If adjustable, return it to the manufacturer’s recommended setting.
• Check sensor line: If a small tube connects the boiler to a pressure sensor, ensure it is not blocked with scale. Clean or replace as needed.
• Control fault: If the boiler continues to heat beyond setpoint, the pressurestat or control board heater driver may be stuck and must be replaced by a technician.