Display shows E10, heater will not start; may be accompanied by low water pressure in the system.

Safety: Turn OFF power before removing any water connections. Protect electronics from water spills.

• Check mains pressure: Open a cold tap and verify that water pressure is adequate. If pressure is low throughout the house, contact your water supplier.
• Verify valves: Ensure the cold water isolation valve to the Termet heater is fully open.
• Clean inlet filter: Remove and clean the inlet filter screen on the hydraulic block. Rinse thoroughly and reinstall.
• Pressure sensor: On models with a pressure sensor, check the wiring and, if accessible, gently tap the sensor to free any stuck diaphragm. Replace the sensor if faulty.
• Retest: Restore power and open a hot tap. If E10 persists despite good pressure, a technician should test and replace the pressure switch/sensor.