This page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. The following information, will take you through the fault finding sequence or steps, for rectifying a Vaillant Ecotec boiler with this fault code. Suggested solutions will be detailed further down the page.
According to the installation and servicing instructions manual, “safety switch-off: Flame simulation”. Also according to other sources, “Incorrect Flame Detection Fault (Flame Detection Even Though The Gas Valve Is Off)”
Cause of F27
According to the installation and servicing instructions manual. there is moisture on the electronics, electronics (flame monitor) defective, gas solenoid valve leaking. According to vaillant the causes are as follows.
Damage On The Electrode Or The Ignition Lead
Moisture Present On The Electronics
Fault On The Spark Generator
Fault On The Main PCB
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