Error 270

Safety precautions:

1) If you smell gas, evacuate the property immediately, call the gas emergency number and do not operate electrical switches or the boiler. 2) Before any checks that require touching the boiler controls, turn the boiler off and back on only using the front panel controls as described in your manual. Do not remove the boiler casing or attempt to access gas components. 3) If you are unsure or uncomfortable at any point, stop and contact a Gas Safe registered engineer.

Initial homeowner checks you can do:

1) Check that the room thermostat and programmer are set correctly and that the time/date schedule is calling for heat. A simple change in thermostat set temperature will cause modulation up. 2) Check the hot water demand: if a tap or shower has been turned on, the boiler will modulate to provide DHW. 3) Check radiator thermostatic valves (TRVs) — if many TRVs are opened at once the boiler demand will rise. 4) Check the system pressure on the gauge; it should typically be around 1.0–1.5 bar when cold. Top up the system if pressure is low following the manufacturer instructions. 5) Listen for the pump running and feel flow and return pipes (carefully) to see if the pump is circulating water. 6) Check the boiler display/info menu for any additional cause or fault codes (use the spanner/info button) and note any codes and their descriptions.

Simple diagnostic and fix steps to try:

1) If the display only shows 270 and the heating/hot water demand is legitimate, observe the boiler for 10–15 minutes. If it brings the system to temperature and then settles, no action is needed. 2) If you want to attempt a reset: follow the manual method for your model (press the reset button or hold the temperature dial light for ~3 seconds). Only reset once; do not repeatedly reset a boiler that then locks out. Do not reset if the display shows an EA locking code (ignition lockout) — in that case contact an engineer. 3) If the boiler is struggling to reach temperature or is modulating upwards continuously: check and bleed radiators to remove airlocks, top up system pressure if low, and ensure external controls (programmer, thermostat, room stats) are working and calling correctly. 4) If you suspect a circulation issue (pump not running or slow), check that the pump is powered (but do not remove pump covers or attempt mechanical repairs). Airlocks or a seized/slow pump will cause temperature differentials and odd modulation behaviour; bleeding radiators and running the system to purge air may help. 5) If you see other informational cause codes in the GB162 list such as 260 (flow sensor not detecting rise), 265 (regular partial load switching), 2924/2925 (gas valve feedback), or any E/CE/F0/EA codes, record them and stop further DIY — these indicate sensor, gas valve, control or safety issues.

When to call a professional:

1) Call a Gas Safe registered engineer if the boiler repeatedly displays 270 but fails to reach set temperatures, shows other fault codes, cycles frequently, locks out, or you detect any abnormal noises, smells of gas, leaks, or overheating. 2) Do not attempt to replace or repair gas, electrical control boards, sensors, or the gas valve yourself. 3) Provide the engineer with the exact displayed codes and a description of what you observed (how long the behaviour has been happening, any recent maintenance like bleeding radiators, and the system pressure). A qualified engineer will run deeper diagnostics (flow/return temperature checks, sensor and gas valve feedback tests, pump and flow-rate checks) and carry out any required repairs or part replacements.

Summary note: Error 270 alone usually just means the boiler is increasing output to meet demand and is not an immediate fault, but if it is persistent, accompanied by other fault codes, or the boiler does not provide heat/hot water as expected, stop and arrange a Gas Safe engineer to diagnose and repair the underlying cause.