Boiler
E160
The E160 error code on a Baxi boiler indicates a fan or air pressure fault — specifically a problem with the flue gas extraction system. It’s a lockout error, meaning your boiler has shut down as a safety precaution and won’t restart until the underlying fault is resolved.
What does this error mean?
Baxi’s E160 code signals that the boiler’s PCB (printed circuit board) has detected an issue with the air pressure switch or the fan that drives combustion gases out through the flue. The boiler monitors airflow to ensure safe combustion; if airflow is too low or the fan isn’t running at the correct speed, the boiler locks out to prevent dangerous gases building up. This is a safety-critical fault — the boiler is doing exactly what it should by refusing to fire.
Est. repair cost
£80–£350 depending on whether it’s a pressure switch or fan replacement; new boiler £1,500–£2,500 installed
🔍 Likely causes
🛠️ Step-by-step fix
Check the external flue terminal (the white pipe outlet on your outside wall) — make sure it isn’t visibly blocked by debris, ice, or a bird nest. Clear any obvious obstructions safely from ground level.
Check the condensate pipe — if it’s winter and the pipe runs outside, it may be frozen. Thaw it carefully by pouring warm (not boiling) water over the external section, then attempt a reset.
Press and hold the boiler’s reset button for 3–5 seconds (consult your Baxi manual for the exact reset procedure for your model). Wait 5 minutes for the boiler to attempt a restart.
If the error returns immediately or within a few minutes, do not attempt further resets — repeated failed relights can be unsafe. Stop here and call a Gas Safe registered engineer.
Do NOT attempt to access the boiler casing, inspect the fan, test the pressure switch, or touch any internal gas components. These tasks require Gas Safe registration and are illegal for unqualified individuals to perform.
📞 When to call a professional
If a single reset doesn’t clear the E160 fault, call a Gas Safe registered engineer — do not attempt to open the boiler or diagnose the fan or pressure switch yourself. Tell the engineer: ‘My Baxi boiler is showing E160, I suspect a fan or air pressure switch fault.’ This helps them arrive with the right parts and reduces call-out time. Find a Gas Safe engineer at gassaferegister.co.uk.
⚖️ Repair or replace?
A fan replacement on a Baxi boiler typically costs £150–£350 including parts and labour; an air pressure switch is cheaper at £80–£180. If your boiler is over 10 years old and repair costs exceed £400, replacement is often the more economical long-term choice — a new Baxi or equivalent A-rated combi boiler costs £1,500–£2,500 fully installed in the UK. For boilers under 8 years old in otherwise good condition, repair is almost always the right call.