Display shows F42; may be associated with incorrect temperature readings or rapid cycling.

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 Ferroli NTC sensor (flow, return, or DHW), Damaged sensor cable shorting to chassis, Water ingress into sensor connector

Safety: Turn off power before handling sensors.

Steps:

Identify which NTC: Refer to the Ferroli manual to see which sensor F42 refers to on your model.
Inspect cable: Look for crushed or cut insulation along the sensor cable.
Dry connectors: If moisture is present, dry thoroughly and correct any leaks.
Reset: After inspection, restore power and reset the unit.

Professional help: Sensor resistance testing and replacement should be done by a technician.

Medium 3/5

Relevant NTC Temperature Sensor

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