Vaillant Common Faults and Error Codes
F22: Reduced Water Pressure – This code is shown when the water pressure in your system drops below a minimum required level, which may be caused by leaks or naturally occurring pressure drop with time.
F28: Failure to Ignite – This indicates that the boiler has failed to burn, possibly because of irregular gas supply, ignition electrodes failure or blocked flue.
F29: Flame Out – Like F28, this code means that after being ignited; the burner’s flame has gone out probably due to gas supply issues or a breakdown on the flame detection device.
F75: Pump/Water Pressure Sensor Faults – Whenever there is a difference between readings of water pressure sensor and actual water pressure this code appears mostly due to pump problem or sensor fault itself.
F27: Flame Detection Fault When There Is No Flame – It might only mean that there is fire even when fire is not present leading to have a malfunctioned flame detection system.
F32: Fan Speed Fault – If there’s something wrong with fan speed it will be indicated by this code either because it goes beyond its expected range, or fails doing so as well.
F62: Gas Valve Shut Off Delay – This suggests that the valve isn’t shutting down at right time hence implying an issue either with control board or valve itself.
F83: Flow and Return NTC Fault – The flow temperature sensors indicate something different from what return temperature sensors measure; this might result from faulty sensors for one reason or another; otherwise water circulation may go wrong.
Troubleshooting and Resolution
Some Vaillant boiler fault codes signal issues that can be sorted out through simple checks and adjustments, while others need a Gas Safe registered engineer. Regular maintenance and servicing of a boiler will help prevent many common problems, and ensure it is both efficient and safe.
