Remeha (part of BDR Thermea Group) manufactures high-efficiency condensing boilers popular in commercial and domestic settings across Europe. Their Avanta and Calenta ranges are known for compact design and reliability.
Remeha Boiler Fault Codes
All Remeha Fault Codes 35
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| 01 | No Flame Detected The boiler has failed to ignite or lost its flame. Gas supply, ignition electrode, or… | High | Engineer | View Guide |
| 02 | Safety Thermostat Activated The boiler has exceeded its maximum safe temperature and the safety thermostat has triggered. | High | Engineer | View Guide |
| 03 | Flue Gas Thermostat Activated The flue gas temperature has exceeded the safe limit. | High | Engineer | View Guide |
| 04 | False Flame Signal The ionisation electrode is detecting a flame when the gas valve should be closed. This… | High | Engineer | View Guide |
| 05 | Flame Lost During Operation The flame was established but has been lost during normal operation. | High | Engineer | View Guide |
| 06 | Fan Fault The fan is not running at the correct speed or is not starting. | High | Engineer | View Guide |
| 07 | Air Pressure Switch Fault The air pressure switch is not detecting correct airflow. | High | Engineer | View Guide |
| 08 | Gas Valve Fault The gas valve is not responding correctly to commands from the PCB. | High | Engineer | View Guide |
| 10 | Flow Temperature Sensor Fault The flow NTC temperature sensor has developed a fault. | Medium | Engineer | View Guide |
| 11 | Return Temperature Sensor Fault The return NTC temperature sensor has a fault or open circuit. | Medium | Engineer | View Guide |
| 12 | DHW Temperature Sensor Fault The domestic hot water NTC sensor has developed a fault. | Medium | Engineer | View Guide |
| 14 | Low Water Pressure System water pressure has dropped below the safe minimum. | Low | DIY Check | View Guide |
| 15 | Pump Fault The circulation pump is not running or is blocked. | High | Engineer | View Guide |
| 16 | Pump Over-Speed The pump is running faster than expected, possibly indicating an internal fault. | Medium | Engineer | View Guide |
| 18 | PCB Fault The printed circuit board has an internal communication or memory error. | High | Engineer | View Guide |
| 20 | Outdoor Sensor Fault The outdoor temperature sensor is faulty or disconnected. | Low | Engineer | View Guide |
| 22 | Overheat Protection Safety thermostat activated due to overheating. | High | Engineer | View Guide |
| 23 | Flow/Return Differential Too Large Temperature gap abnormal — poor circulation. | Medium | Engineer | View Guide |
| 24 | Condensate Drain Blocked The condensate drain pipe is blocked or frozen. | Medium | DIY Check | View Guide |
| 25 | Rapid Temperature Rise Flow temp rising too quickly. | High | Engineer | View Guide |
| 26 | Flame Detected After Shutdown Flame signal with gas valve closed. | High | Engineer | View Guide |
| 27 | Ignition Electrode Fault The ignition electrode is worn or not sparking correctly. | High | Engineer | View Guide |
| 28 | Combustion Fault Air/gas outside limits. | High | Engineer | View Guide |
| 29 | Diverter Valve Timeout Valve didn't switch in time. | Medium | Engineer | View Guide |
| 30 | Three-Way Valve Fault The diverter/three-way valve is stuck or not switching correctly between heating and hot water. | Medium | Engineer | View Guide |
| 31 | eBUS Fault Communication fault. | Medium | Engineer | View Guide |
| 32 | Mains Voltage Fault Voltage outside range. | Medium | Engineer | View Guide |
| 33 | EEPROM Error PCB memory error. | High | Engineer | View Guide |
| 34 | Phase/Neutral Reversed Polarity reversed. | High | Engineer | View Guide |
| 35 | Combustion Fault The combustion quality is outside the acceptable range. | High | Engineer | View Guide |
| 36 | Coding Plug Fault Coding plug unreadable. | High | Engineer | View Guide |
| 37 | Flue Gas Overheat Flue gas too hot. | High | Engineer | View Guide |
| 38 | Frost Protection Frost protection running. | Medium | DIY Check | View Guide |
| 39 | Pressure Sensor Fault Electronic sensor faulty. | Medium | Engineer | View Guide |
| 40 | Pump Speed Error Pump running outside range. | Medium | Engineer | View Guide |