Chaffoteaux & Maury was a French boiler manufacturer, now part of the Ariston Group. Their Britony and Celtic ranges were extremely popular in UK homes from the 1980s through to the 2010s. While no longer sold in the UK under the Chaffoteaux name, many installations remain. Modern Chaffoteaux models (Pigma, Mira) use Ariston-style fault codes.
Chaffoteaux Boiler Fault Codes
All Chaffoteaux Fault Codes 23
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| 101 | Overheat Protection The safety thermostat has activated. The boiler exceeded its maximum safe temperature. | High | Engineer | View Guide |
| 103 | Poor Circulation / Flow Fault The boiler is detecting poor water circulation. The temperature rise is too rapid. | Medium | Engineer | View Guide |
| 108 | Low Water Pressure System pressure has dropped below the safe minimum. | Low | DIY Check | View Guide |
| 110 | Flow Temperature Sensor Fault The flow NTC sensor has developed a fault or open circuit. | Medium | Engineer | View Guide |
| 112 | Return Temperature Sensor Fault The return NTC sensor is faulty. | Medium | Engineer | View Guide |
| 15 | Overheat Sensor Open (LED code) On older Britony models using LED fault codes: the overheat sensor switch is open. | High | Engineer | View Guide |
| 30 | Overheating Without Lockout (LED code) The boiler is approaching overheat but has not yet locked out. | High | Engineer | View Guide |
| 301 | Flue/Combustion Fault A fault has been detected with the flue gas path or combustion quality. | High | Engineer | View Guide |
| 304 | Fan Fault The fan is not running at the correct speed. | High | Engineer | View Guide |
| 40 | No Flame Detection (LED code) The ionisation electrode is not detecting a flame. | High | Engineer | View Guide |
| 50 | Ionisation PCB Fault (LED code) The ionisation circuit on the PCB is faulty. | High | Engineer | View Guide |
| 501 | Ignition Failure No flame detected after ignition attempt. | High | Engineer | View Guide |
| 60 | Antifrost Mode — Pump Running (LED code) The boiler is in frost protection mode with the pump running. | Medium | DIY Check | View Guide |
| 604 | Air Pressure Switch Fault The APS is not confirming correct airflow. | High | Engineer | View Guide |
| 607 | Fan/Flue Airflow Fault Airflow proving has failed — fan or flue issue. | High | Engineer | View Guide |
| 610 | DHW Sensor Fault The domestic hot water NTC sensor is faulty. | Medium | Engineer | View Guide |
| 70 | Antifrost Mode — Burner Running (LED code) The boiler is in frost protection mode with the burner firing. | Medium | DIY Check | View Guide |
| 80 | DHW Thermistor Open Circuit (LED code) The hot water sensor circuit is broken. | Medium | Engineer | View Guide |
| E01 | Ignition Failure (modern models) No flame detected on Pigma/Calydra Green models. | High | Engineer | View Guide |
| E02 | Safety Thermostat (modern models) Overheat protection on newer Chaffoteaux models. | High | Engineer | View Guide |
| E03 | Low Pressure (modern models) Low system pressure on newer models. | Low | DIY Check | View Guide |
| E04 | Flow Sensor Fault (modern models) Flow NTC fault on Pigma/Calydra Green. | Medium | Engineer | View Guide |
| E05 | Return Sensor Fault (modern models) Return NTC fault on newer models. | Medium | Engineer | View Guide |