CTC Flame Instability / Early Flame Loss

Boiler starts then shuts down after a few seconds without showing a specific error code.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low gas pressure, Partially blocked burner, Faulty ionisation electrode, Flue or air intake restriction

Safety: Turn off gas and power. Only a qualified gas technician should adjust gas supply or burner settings.

Check other gas appliances: If they also perform poorly, contact the gas supplier to check supply pressure.
Inspect flue terminal: Ensure the flue and air intake are clear.
Clean burner and electrodes (technician): Remove the burner and electrodes, clean them, and check for correct positioning.
Measure gas pressure (technician): Check inlet and burner pressures at the CTC gas valve and adjust or replace components as required.

Professional Required 5/5

Ionisation Electrode

Check Price on Amazon

We may earn a commission from links on this page.