201
Ariston
Ignition Failure / No Flame Detected
Boiler shows 201, no ignition, fan may run briefly then stop
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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
No gas supply or low gas pressure, Faulty ignition electrode or lead, Blocked burner or injector, Faulty gas valve or wiring
How to Fix / Troubleshooting
Critical safety: Gas work must be carried out by a Gas Safe registered engineer. Do not attempt to dismantle gas components.
- Check gas supply: Ensure other gas appliances (e.g. hob) work. If not, contact your gas supplier.
- Reset boiler: Follow the Ariston manual to reset. If 201 clears and returns frequently, further diagnosis is needed.
- Visual inspection: Through the viewing window (if present), check for signs of ignition spark when the boiler tries to fire. No spark suggests an ignition electrode or PCB issue.
- Condensate and flue: A blocked condensate trap or flue can prevent ignition. Check the external condensate pipe for freezing or blockage and clear if safe to do so.
- Call an engineer: An engineer will test the gas valve, burner, ignition electrode, and flame sensor, and adjust or replace as required.
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Repair Difficulty
Professional Required
5/5
Required Part
Ignition Electrode
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