Boiler displays F74, pressure reading too high or sensor short 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

Shorted pressure sensor, Wiring short to ground or between pins, PCB analogue input fault

Safety: Isolate power before testing.

Steps:

Disconnect the pressure sensor and check if the error changes; if it does, the sensor is likely faulty and should be replaced.
Inspect wiring for shorts or crushed insulation and repair as needed.
If wiring and sensor are OK, replace the PCB.

Medium 3/5

Water Pressure Sensor

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