Immergas Short Cycling / Control Instability

Boiler cycles on and off rapidly (short cycling) without maintaining stable temperature.

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 parameter settings, Blocked or closed radiators, Faulty temperature sensor

Safety: Short cycling reduces boiler life but is not usually an immediate hazard.

Open more radiators: Ensure enough radiators are open to absorb boiler output.
Check bypass: Verify that an automatic bypass valve is fitted and correctly set if required by Immergas.
Adjust parameters (engineer): Reduce maximum CH output and adjust anti-cycling time in the installer menu according to system size.
Sensor check: Test flow and return NTC sensors for correct readings and replace if faulty.

Medium 3/5

Flow NTC Sensor

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