Atlantic Short Cycling / Unstable Operation

Boiler starts then shuts down after a few seconds without showing an error code, heating and hot water are unreliable.

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

Oversized boiler for system, Incorrect minimum power setting, Faulty modulation control, Poor system water volume

Safety: Frequent cycling can damage components and waste energy.

Check thermostat settings: Avoid very narrow temperature bands or excessively high setpoints that cause rapid on/off cycles.
Ensure enough radiators are open: Closing too many radiators reduces system volume and causes short cycling.
Professional adjustment: A technician can adjust minimum burner power, check modulation, and recommend system changes (e.g., buffer tank) if the boiler is oversized.

Medium 3/5

Gas Valve / Modulation Control

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