Guides Search

Home › Worcester Bosch › Boilers › EA / EA 227

Worcester Bosch Boiler EA / EA 227 Error Code

Burner didn't light (no flame detected) on Worcester Bosch boilers.

Worcester BoschAll Worcester Bosch boiler codes

EA / EA 227
Moderate DIY

The boiler went through its lighting sequence and the flame sensor never picked up a flame, so it locked out. Worcester's user instructions name three things a homeowner can look at: no gas or low gas pressure, a condensate outlet blocked by ice or debris, or a blocked flue outlet. The CDi Classic engineer's booklet adds the internal suspects, such as air in the gas supply, the gas valve, the electrodes and ignition cable, a poor earth or the PCB.

Compatible models

Listed in the user instructions for Greenstar CDi Classic ErP combis (29, 34, 38 and 42) and the HighFlow 440CDi and 550CDi ErP, where it shows as EA. Greenstar i ErP (25i and 30i combi, 9i to 24i system) and Si Compact ErP manuals list EA with a cause number, and the GB162 V2 commercial boilers show EA227.

Also shown as

Greenstar CDi Classic and HighFlow CDi models show EA on its own. Greenstar i and Si Compact models show EA with a three-digit number underneath, and their manuals use EA and 227 as the example to quote. Worcester's GB162 V2 commercial boilers list EA227 as no burner ignition.

Difficulty

Start with the safe checks below; a worn part may need replacing.

Not sure you are reading the code right? See how to read Worcester Bosch boiler codes.

Safety first: never take the casing off a gas boiler. If you smell gas, open windows, don't use light switches, turn the gas off at the meter if you can and call your gas emergency number from outside. A carbon monoxide alarm going off means the same: switch the boiler off, get fresh air and call.

How to fix Worcester Bosch EA / EA 227

  1. Check that gas is reaching the house

    Try lighting a gas hob or fire first. If none of them light, look at the meter: a prepayment meter may have run out of credit. If the other gas appliances work and the boiler still won't light, Worcester's manuals send you to your gas supplier for a supply or pressure problem.

  2. Look for a frozen condensate pipe

    In a cold snap, follow the plastic condensate pipe outside and feel for ice at bends, dips and the open end. Only deal with a section at ground level that you can reach without a ladder. Warm it with a hot water bottle, a microwave heat pack or a cloth soaked in hot water, or pour hot (not boiling) water over it, and watch for ice forming on paths afterwards.

  3. Glance at the flue terminal

    From the ground, check the flue outlet on the outside wall isn't covered by a bird's nest, ivy, a bag or a stack of garden furniture. Don't climb up to it.

  4. Reset the way your model wants

    On a Greenstar i or Si Compact, press reset once and the word Reset shows briefly. On CDi models, hold the button for 3 seconds, or 5 seconds after thawing a condensate pipe. Allow 2 to 3 minutes for the boiler to start again.

When to call a technician

Gas on, condensate pipe clear and EA 227 still back after a reset: book a Gas Safe registered engineer (RGII in Ireland) to look at the ignition and gas side. Smell gas at any stage and you leave the house and ring your gas emergency number from outside.

Parts linked to EA / EA 227

These are the parts an engineer usually checks for this code. They sit inside the sealed casing, so leave them to a Gas Safe registered engineer.

Frequently asked questions

Which Worcester Bosch models show the EA / EA 227 code?

Listed in the user instructions for Greenstar CDi Classic ErP combis (29, 34, 38 and 42) and the HighFlow 440CDi and 550CDi ErP, where it shows as EA. Greenstar i ErP (25i and 30i combi, 9i to 24i system) and Si Compact ErP manuals list EA with a cause number, and the GB162 V2 commercial boilers show EA227.

Can I fix Worcester Bosch EA / EA 227 myself?

Only the outside checks above. If they don't clear EA / EA 227, the fix is inside the boiler and needs a Gas Safe registered engineer.

Other Worcester Bosch boiler codes

Last reviewed 2026-10-21. Codes and steps can vary by model; check your owner's manual.

Sources we checked