Error C7 214

Safety precautions:

- If you smell gas at any time, get everyone out of the property and call the gas emergency number immediately. Do not touch electrical controls or operate the boiler.

- Never open sealed or safety-critical compartments or attempt mains-voltage electrical tests unless you are a qualified Gas Safe engineer. Working on the boiler internals can be dangerous and will usually void warranties.

- Do not repeatedly reset the boiler. More than 2–3 resets risks damage and delays correct diagnosis.

Initial checks a homeowner can safely do:

1) Check the boiler has power: the display should be on. If the display is dead, check the household fuse/circuit breaker and the boiler isolator switch.

2) Perform a single reset: use the boiler’s reset or OFF/ON method (turn off, wait 30 seconds, turn on) or the mode selector reset position. Wait to see if the C7 returns. If the fault clears, monitor the boiler and arrange a service; if it returns immediately, proceed with the following checks.

3) Listen during the startup attempt: when you try to call for heat or hot water, the fan should spin briefly before ignition. If you hear nothing at all, that confirms the fan is not running. If you hear the fan but it is slow or noisy, note that down.

4) Visually inspect external flue and air intake: look outside where the flue terminates to make sure it is not blocked by debris, bird nests, leaves or ice. Clear any obvious external obstructions from the terminal (do not force anything into the flue). A blocked flue can stop correct fan operation.

5) Note any recent events: heavy rain, freezing weather or a recent service. Record the exact error code, time and conditions to tell the engineer.

Specific diagnostic and fix steps (to be done only by a qualified engineer):

- The engineer will check the fan wiring and connector to the PCB for loose or corroded contacts and measure whether the PCB is supplying the correct voltage/signal to the fan. A lost supply points to a PCB fault.

- They will check the fan motor electrically and mechanically: continuity/resistance checks, tachometer signal where fitted, and by removing the fan housing inspect the impeller for seizure, debris or damage.

- If the fan is seized, damaged or electrically failed it will be replaced with the correct fan assembly. If the fan is working but the PCB is not commanding it, the PCB (or burner control/burner control unit/KIM depending on model) may need repair or replacement.

- The engineer will also inspect the flue and condensate paths and verify no secondary causes (e.g. flue restriction causing abnormal fan loading). They will test the boiler through a full start sequence to confirm the fault is resolved.

When to call a professional and what to expect:

- Call a Gas Safe registered engineer if the C7 persists after a single reset, if you hear no fan noise during start, if you find an internal obstruction, or if any wiring or internal components look damaged. The fault involves combustion safety and electrical systems and requires qualified testing and possibly part replacement.

- Provide the engineer with the exact fault code (C7 214), details of what you observed (no fan noise, slow fan, whether the reset cleared the fault), and any external flue findings. Do not attempt to replace the fan or PCB yourself unless you are qualified to work on gas appliances.

Final notes:

- A single safe reset and external flue check are reasonable homeowner actions. Beyond that, leave diagnostics and repairs to a Gas Safe engineer. Do not ignore the fault; the boiler will remain unserviceable until the root cause is fixed.