Boiler shows F73, pressure reading too low or sensor open circuit

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

Disconnected or broken pressure sensor wiring, Faulty water pressure sensor, PCB input fault

Safety: Isolate power and allow the boiler to cool.

Steps:

Inspect the water pressure sensor connector and wiring for disconnection or damage; reconnect or repair as needed.
Test the sensor with a multimeter; replace if open circuit or out of specification.
If a new sensor does not resolve the issue, the PCB may be defective and require replacement.

Medium 3/5

Water Pressure Sensor

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