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.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|