Ariston Short Cycling / Oversized Boiler or Control Issue

Boiler repeatedly starts and stops (short cycling) without reaching set temperature

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Safety Warning

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.

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Possible Causes

Boiler output too high for system, Incorrect thermostat placement, Blocked or closed radiators, Faulty temperature sensors

How to Fix / Troubleshooting

Safety: Adjustments to boiler parameters should follow the Ariston installation manual.

  • Check radiator valves: Ensure enough radiators are open to dissipate the boiler's heat output.
  • Thermostat location: Make sure the room thermostat is not near a heat source or in direct sunlight, which can cause premature shut-off.
  • Adjust boiler output: On many Ariston models, the maximum CH output can be reduced via installer settings. Have a competent person lower the output to better match the system.
  • Sensor check: Faulty flow or return NTC sensors can cause incorrect temperature readings and cycling. Replace if necessary.
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Repair Difficulty

Medium 3/5

Required Part

Flow Temperature Sensor (NTC)
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