Boiler displays A10, will not start, pressure reading on the display is unrealistic or fixed.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

defective electronic pressure sensor, blocked sensor port, damaged wiring harness, PCB analogue input failure

Safety: Allow the boiler to cool and isolate the power. Close isolation valves if removing the sensor.

Technician actions:

Compare the displayed pressure with the mechanical gauge (if fitted). If they differ significantly, suspect a faulty sensor.
Inspect the pressure sensor body on the hydraulic block for leaks or corrosion.
Remove and check the sensor port for sludge or debris; clean carefully.
Test the sensor output voltage against the actual pressure according to IVT service data.
Replace the water pressure sensor if faulty; if readings remain incorrect, test/replace the PCB.

Medium 3/5

Water Pressure Sensor

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