Navien Water Pressure Sensor 30014542A

The water pressure sensor is a Navien component that monitors the water pressure within the heating circuit of NCB-CE series boilers. It provides this reading to the boiler's control system, which uses it to regulate operation and trigger a fault or lockout when pressure falls outside the permitted range. The part is listed under Navien part number 30014542A.

• Boiler locks out or displays a low water pressure fault despite the system being correctly filled and vented.
• Pressure reading on the boiler display is erratic, sticks at a fixed value, or fails to respond when the system is topped up.
• Persistent pressure-related error codes that return after resetting the boiler.
• Boiler refuses to fire even though the gauge on the system shows adequate pressure.

• Confirm the boiler model and output match one of the NCB-CE variants listed above.
• Check the part number stamped or labelled on the existing sensor against 30014542A.
• Verify the system pressure with an external gauge before condemning the sensor, as blockages or air in the circuit can mimic a sensor fault.
• Isolate the appliance and depressurise the relevant circuit before removal.