Display shows “ERR1” and brewing is disabled.

Safety first: Unplug the coffee maker and allow it to cool completely. Do not attempt to access internal components while hot.

• Power reset: After cooling, unplug the unit for 10 minutes, then reconnect and check if ERR1 clears. Transient faults can sometimes reset.
• Check for external causes: Ensure the machine is not placed against a wall or in a confined space that traps heat. Provide adequate ventilation around the unit.
• Inspect for moisture: Look around vents and the base for signs of water intrusion that might have reached internal electronics. If you see internal condensation or water, do not power the unit; allow it to dry for 24 hours in a warm, dry room.
• Do not bypass sensor: Never attempt to short or bypass the temperature sensor; this can cause overheating and fire risk.
• Professional service: If ERR1 persists, the boiler temperature sensor or its wiring must be tested and likely replaced. This requires opening the housing and working near mains‑voltage components; contact a qualified appliance technician or OXO support.