Error T2

Safety first

- If you smell gas at any time, turn off the gas supply at the meter, do not operate electrical switches, open windows for ventilation and call the gas emergency service immediately.

- If you are not competent with electrical or gas equipment do not open the boiler casing or attempt internal repairs. Work on sealed combustion components must be done by a Gas Safe registered engineer.

- Turn off the boiler electrical supply at the isolator or fuse before doing any close-up checks of the unit exterior or flue terminal.

Initial homeowner checks (safe, non-intrusive)

1) Note the exact error code, any flashing LED pattern, and the circumstances (was the boiler mid‑heat cycle, after a reset, during a cold start?). This helps the engineer. 2) Try a soft reset: follow the boiler manual reset procedure (typically press and hold the reset or check button for ~8 seconds until the unit reboots). If the fault goes away and does not return, monitor for recurrence. 3) Check the external flue terminal: from outside, visually inspect the flue outlet for obvious blockages (bird nest, leaves, debris, or snow/ice). Clear small, external obstructions if accessible and safe to do so. 4) Check vents and air intake paths to the boiler room are not blocked. 5) Verify mains power to the boiler and any relevant fuses or RCDs haven’t tripped.

What to listen/observe for when attempting to start the boiler

- On a call for heat or DHW, listen at the front of the boiler for the fan trying to run (a running fan has a steady whirr). If you hear a brief spin or a hum but no steady rotation, this is a sign of a failing fan motor or seized bearings. If you hear nothing at all, the fan may not be receiving power or may have failed completely.

More detailed diagnostic guidance (for information only; do not open the boiler if you are not qualified)

- If you are competent and experienced with appliances and have isolated power: only then and only if comfortable, you can check the fan wiring plug for obvious signs of damage or a loose connector. Do not probe live circuits. If there are burnt connectors, melting or a strong burning smell, stop and call an engineer.

- If the flue was blocked and you cleared it externally, try a reset again. If the T2 returns immediately or the fan does not run, the problem is likely internal (fan motor, capacitor, wiring, or PCB).

- Avoid repeated resets: multiple resets will not cure a genuine fault and can lead to further lockouts or misleading fault memory. Record how often the fault occurs and any other codes shown.

When to call a professional and what to tell them

- Call a Gas Safe registered heating engineer if the fault persists after the basic checks, if you detect a humming/noise but no fan rotation, if you found damaged wiring/connectors, or if you are unsure. Do not attempt to replace the fan, motor, fan lead, or control board yourself.

- When you call the engineer, give them: the exact boiler model, serial number (if available), the T2 fault code and any other displayed codes or LED behaviour, what checks you have already done (reset, flue clear, power check), and whether the fault is intermittent or permanent.

What the engineer will typically do

- A qualified engineer will perform a safe isolation, remove the boiler casing, verify supply and control voltages to the fan, test fan rotation and fan speed sensing, inspect and test the flue for pressure/flow, check the connector and fan wiring, and read any stored fault logs. Depending on findings they may clear the fault, replace the fan motor, fan assembly, fan cable/connector, or replace/repair control electronics if required.

Final notes

- Because the fan is part of the combustion safety system, do not operate the boiler if you suspect the fan or flue system is compromised. Prioritise safety, check warranty or service contract before arranging a callout, and use a Gas Safe registered engineer for any internal work or component replacements.