Error 270

Safety first

- If you smell gas: do not touch the boiler, open windows, leave the property immediately and call the gas emergency number. Do not use electrical switches or phones inside the building.

- Before you touch valves or open the boiler casing turn the boiler off at the control panel and isolate electrical supply at the fused spur if you will open the cover. If you are only topping up pressure or bleeding radiators you do not normally need to open the boiler casing, but switch the boiler off while you work and allow it to cool.

Initial homeowner checks (simple, safe checks you can do)

1. Note the exact display or LED pattern and the times the error appears. Try a single reset: press and hold the reset button for 5–10 seconds and observe.

2. Check the system pressure on the boiler gauge. Target pressure for most Baxi systems is about 1.0–1.5 bar when cold. If it is below ~0.8 bar or below the safe threshold shown in your manual, that can cause dry-fire/circulation faults.

3. Look for obvious leaks around radiators, pipework and the boiler. If you find a leak, isolate the system and call a professional.

4. Check radiators for cold tops and hot bottoms (air in the system) and listen at the boiler for pump noise (a faint hum when the CH demand is on).

5. In cold weather check the external condensate pipe for freezing (less likely to cause a dry-fire code but can cause other lockouts). If frozen, thaw with warm water (not boiling).

If pressure is low: how to top up (general guidance)

1. Locate the filling loop (usually a flexible hose under the boiler with two isolating valves or a built-in lever). Ensure the boiler is off.

2. Open the valves slowly and watch the pressure gauge. When the gauge reaches around 1.0–1.5 bar close both valves. If the filling loop is a removable hose, remove it after filling and store it safely.

3. Turn the boiler back on and try a reset. Bleed any radiators that had air, then re-check system pressure and top up again if it falls below target.

4. If pressure drops again soon after topping up, do not keep filling repeatedly—this indicates a leak or faulty component and you should call an engineer.

If circulation or pump is suspected

1. With heating demand on, listen at the boiler for the pump running and for water flow noises. If the pump is silent or the boiler shows continued circulation errors, do not attempt internal electrical repairs.

2. Check radiator thermostatic valves are open (especially the return-side valves) and any zone valves are in the open position.

3. Bleed radiators to remove trapped air which can prevent flow; re-pressurise after bleeding.

After checks: attempt a controlled restart

1. With pressure corrected and any trapped air bled, press and hold the reset button for 5–10 seconds to allow the boiler to attempt a restart.

2. Observe the boiler. If it restarts and runs normally, monitor pressure and system performance over the next 24–48 hours.

3. If the E270 returns, or the boiler locks out repeatedly, do not keep resetting it.

When to call a professional (Gas Safe engineer)

- The fault returns after you have topped up the system and bled radiators.

- System pressure is continually falling or you found a leak.

- The pump appears not to run, or you hear unusual noises from the pump/valves.

- You smell gas, or there are ignition/flame failures in addition to the E270 code.

- You are uncomfortable performing the checks above.

Do not attempt any gas, burner, heat-exchanger or PCB repairs yourself. A Gas Safe registered engineer should diagnose persistent dry-fire faults and repair or replace faulty pumps, sensors, valves, or internal components. Repeated DIY resets can mask a serious fault and risk damage to the boiler.