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 …

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