Ferroli Overheating / Temperature Control Failure

Water heater produces water that is too hot, risk of scalding, temperature overshoots setpoint.

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

Faulty DHW NTC sensor, Sticking gas valve not modulating down, Incorrect temperature setting, Scaled heat exchanger causing localized overheating

Safety: Risk of scalding. Reduce the temperature setting immediately and warn occupants.

1. Lower setpoint: Turn down the Ferroli temperature control to a safe level (around 50°C) and test again.
2. Check DHW NTC: Replace the domestic hot water NTC sensor if readings are unstable or clearly wrong.
3. Descale: Have the heat exchanger descaled to improve heat transfer and reduce hot spots.
4. Gas valve / modulation: A technician should verify that the gas valve modulates correctly and does not remain at high fire when demand is low.

Hard 4/5

DHW NTC Sensor

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