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