BoilerFaultCodesWhat the manual says
Manufacturer manualInterruption Of Gas Supply or Flame Failure (Gas supply interrupted, ignition failed or flame not detected)
What causes this fault?
This fault occurs when the boiler attempts to ignite but cannot establish or maintain a steady flame. The most common reasons include a lack of gas reaching the burner, a faulty ignition spark, or a sensor that is too dirty to detect that the flame has successfully lit.
This fault is more frequent during extreme cold spells because the external condensate pipe can freeze, causing a backup that prevents the boiler from igniting.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like E133: no call-out fees, no surprise bills.
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