Boiler
E228
The E228 error code on a Baxi boiler indicates a fan-related fault — specifically a problem with the flue or combustion fan not performing as expected. This is a safety-critical fault that locks the boiler out and requires prompt attention.
What does this error mean?
Baxi’s E228 code signals that the boiler’s control board has detected the fan is not reaching the correct speed, or is not responding as it should during the startup sequence. The fan is essential for expelling dangerous combustion gases safely through the flue, so the boiler shuts down automatically as a precaution. You will typically see the boiler lockout and be unable to restart until the underlying fault is resolved.
Est. repair cost
£150–£350 for fan motor replacement (parts + labour); PCB replacement £200–£450 if needed
🔍 Likely causes
🛠️ Step-by-step fix
Step 1 — Reset the boiler: Press and hold the reset button for 3–5 seconds (refer to your Baxi manual for your specific model). Wait 2 minutes and see if the boiler fires up normally. A one-off reset can clear a temporary glitch.
Step 2 — Check the flue outlet outside: Go outside and visually inspect the flue terminal (the white plastic pipe on your exterior wall or roof). Ensure it is not blocked by leaves, a bird nest, ice, or any obstruction. Do not attempt to dismantle the flue — clear only external debris safely from ground level.
Step 3 — Check the condensate pipe: In cold weather, the condensate drain pipe (usually a white plastic pipe running outside or to a drain) can freeze and cause boiler lockout. Thaw it carefully with warm — not boiling — water poured over the external section.
Step 4 — Do not attempt further DIY: The fan assembly, wiring, sensors, and PCB are internal gas appliance components. Working on these yourself is unsafe and illegal without Gas Safe registration. Stop here and call a qualified engineer.
Step 5 — Book a Gas Safe registered engineer: Describe the E228 code, how long the fault has been showing, and whether you noticed any unusual noises (humming, grinding) from the boiler before lockout. This helps the engineer diagnose efficiently.
📞 When to call a professional
If the boiler does not restore normal operation after a single reset and a check of the external flue and condensate pipe, call a Gas Safe registered engineer immediately — do not attempt repeated resets or internal investigation. Tell them the exact error code (E228), your boiler model (found on the front panel or inside the casing), and any sounds the boiler made before locking out. A fan fault on a gas boiler is not a DIY repair under any circumstances.
⚖️ Repair or replace?
Fan replacement on a Baxi boiler typically costs £150–£350 including parts and labour, depending on the model and engineer call-out rates in your area. If your boiler is over 10–12 years old and facing a fan or PCB fault, replacement of the entire unit is worth serious consideration — a new A-rated combi boiler costs £1,800–£3,000 installed but will be more efficient and covered by a manufacturer warranty. For boilers under 8 years old in otherwise good condition, repair is almost always the better financial decision.