Ferroli Short Cycling / Oversized Boiler or Control Issue

Boiler frequently cycles on and off rapidly when heating is on, with radiators getting very hot then cooling quickly.

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

Boiler output too high for system, Incorrect control settings, Faulty NTC sensors, Poor circulation or oversized pump speed

Safety first: Short cycling can reduce boiler life but is not usually an immediate safety risk.

Check thermostat location: Ensure the room thermostat is not too close to a radiator or heat source.
Open more radiators: Avoid running the boiler with only one or two small radiators open.
Engineer actions:
- Adjust boiler output settings (maximum CH power) in the parameters.
- Verify NTC sensor readings and replace if inaccurate.
- Balance the system and adjust pump speed.

Medium 3/5

Flow NTC Temperature Sensor

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