Beretta Short Cycling on Low DHW Demand

Water heater cycles on and off rapidly when a small amount of hot water is drawn

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

Minimum modulation too high, Oversensitive flow sensor, Thermostatic mixer causing intermittent demand, Incorrect gas adjustment

Safety: Rapid cycling can stress components. Avoid forcing the unit to run in this condition.

1. Increase flow: When possible, open the hot tap more fully to provide a stable demand.
2. Test with different tap: Try a non-thermostatic tap to rule out mixer behavior.
3. Technician adjustment: A Beretta technician can adjust minimum gas rate and check flow sensor calibration to reduce cycling.

Medium 3/5

Main control board

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