Listed below are the most common error codes that you might see on your Vaillant EcoMax Pro 18/28E range of boiler.
| Fault Code | Possible Cause |
|---|---|
| F.1 | Lack of gas, a fault with the ignition or flue or you may need to adjust the gas valve or replace a defective electrode lead. |
| F.4 | Ignition fault. |
| F.5 | The system has suffered a fault due to overheating. |
| F.6 | Your flow NTC has developed a fault. |
| F.17 | Check the polarity of your system. |
| F.24 | Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock |
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