How often may I press reset?

At most three attempts. Repeated resets on an EA fault can fill the combustion chamber with unburned gas.

Does EA mean the boiler is broken?

Not necessarily — in many cases it is simply an empty gas meter or air in the pipe.

EABoiler & heater codes

Bosch Boiler Error EA — No Flame Detected

The boiler tried to ignite but the flame sensor never confirmed a flame.

Severity: highBosch / Junkers gas combi boilersBuderus, Worcester (Bosch group)

Technical meaning

The ignition electrode sparks but the ionisation sensor reports no flame, so the gas valve closes again for safety.

Symptoms

Boiler tries to start several times then locks out
No hot water and no heating
Display shows EA after the ignition attempt
Clicking sound from the ignition electrode

Most likely causes

1Gas supply interrupted: closed valve, empty meter or air in the line
2Faulty ignition electrode or cracked ignition cable
3Blocked burner or a failing gas valve

How to fix it

1Confirm the gas valve on the appliance and at the meter is fully open.
2Press and hold Reset for about 3 seconds and let the boiler attempt ignition again.
3If the boiler fails three times in a row, stop resetting — the gas valve and electrode need testing.
4Switch the boiler off at the mains for two minutes, then power it back on.
5Listen for the ignition clicks; no clicking points to the ignition transformer or board.
6If you smell gas, close the valve, do not operate any switch and call the emergency gas line.

Güvenli sıfırlama

1. Reset tusuna 3 saniye basili tutun
2. Gaz vanasinin acik oldugunu dogrulayin
3. Kombiyi kapatip 2 dakika bekleyin, yeniden acin
4. 3 basarisiz atesleme sonrasi servis cagirin
5. Gaz kokusu varsa vanayi kapatip acil gaz hattini arayin

Frequently asked questions

How often may I press reset?: At most three attempts. Repeated resets on an EA fault can fill the combustion chamber with unburned gas.
Does EA mean the boiler is broken?: Not necessarily — in many cases it is simply an empty gas meter or air in the pipe.

Copies: 29,880 · Views: 74,300 · Updated: Sep 13, 2026

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