Buderus
Short Cycling
Boiler cycles on and off rapidly 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
Oversized boiler for system, Low water volume in heating circuit, Incorrect control settings (e.g., too narrow differential), Faulty temperature sensor causing premature shutdown
How to Fix / Troubleshooting
Safety: Short cycling reduces efficiency and can damage components over time.
- 1. Check control settings: Review Buderus control parameters for minimum burner on-time and temperature differential; adjust to manufacturer recommendations.
- 2. Increase system volume: Ensure enough radiators or buffer volume are connected. In some cases, adding a buffer tank may be necessary.
- 3. Sensor check: Verify that flow and return sensors are reading correctly and not causing premature shutdown.
- 4. Pump speed: Adjust pump speed to improve heat distribution and reduce rapid temperature rise.
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Repair Difficulty
Medium
3/5
Required Part
Control Board / Temperature Sensors
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