Vaillant EcoMax Pro 18/28E (Fault Codes)

Vaillant EcoMax Pro 18/28E

Fault Code Possible Cause
F.1 Lack of gas, a fault with the ignition or flue – 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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