BoilerFaultCodesYour boiler is failing to detect a flame after it starts up, causing it to shut down for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: An insufficient ionisation current was measured following ignition of the burner
What causes this fault?
This fault occurs when the boiler's internal sensor fails to detect a steady flame after the burner has successfully lit. This is often caused by a dirty or worn-out sensor probe, a blockage in the drainage system that causes water to 'choke' the flame, or an incorrect ratio of gas and air reaching the burner.
This issue is more frequent in very cold weather, as the condensate drainage pipe can freeze, causing water to back up into the boiler and extinguish the flame.
DIY fix possible
Check that your gas emergency control valve is openCheck if other gas appliances in your home are workingReset the boiler using the reset button to see if it was a temporary glitch
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like EA227 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch GB162 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.