Chaffoteaux
Short Cycling / Control or Sizing Issue
Boiler cycles on and off rapidly (short cycling) without reaching set temperature, no error code.
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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, Incorrect minimum power setting, Faulty temperature sensors, Poor system water flow
How to Fix / Troubleshooting
Safety first: Short cycling can reduce boiler life but is not usually an immediate safety hazard.
User-level checks:
- Ensure all radiators are open to increase system load.
- Check that thermostatic radiator valves are not all nearly closed.
Technical checks (qualified personnel):
- Verify correct NTC sensor readings and replace any faulty sensors.
- Adjust boiler parameters (e.g. minimum CH output, anti-cycling time) according to the Chaffoteaux service menu.
- Check pump speed and system balancing to improve flow.
- Consider adding a buffer vessel or low-loss header if the system volume is very small relative to boiler output.
Monitor operation after adjustments to ensure longer, more stable burn periods.
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Repair Difficulty
Medium
3/5
Required Part
Primary NTC Sensor Set
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