Error C7 214

Safety first: do not remove sealed covers, test live voltages, or attempt internal electrical or gas repairs unless you are a qualified Gas Safe engineer. If you smell gas, ventilate the area, turn off the gas supply at the meter if safe to do so, leave the property and call your gas emergency number. Always isolate electrical supply to the boiler before touching any external parts that require access under the instructions in the boiler manual.

Initial homeowner checks you can safely do:

1) Power-cycle and reset: Turn the boiler off at the isolator or mains, wait 30 seconds, then turn back on. If the boiler has a reset/"✔" button, press and hold per the manual (commonly ~8 seconds for Greenstar i) and allow it to attempt restart. Record whether the C7 clears or reappears.

2) Listen and observe during start-up: When a demand occurs (ask for hot water or heating), listen for the fan running before ignition. If you hear no fan noise or no whirring, that matches C7. If you hear the fan struggling or intermittent noise, that points to a mechanical/jammed fan.

3) Check external air intake and flue terminal: Look at the flue termination and air intake outside for blockages (bird nest, leaves, rubbish) and clear any obvious obstruction safely from the ground. Ensure vents and grille are not blocked.

4) Check condensate and pipework if weather is freezing: A blocked condensate can cause other faults; if the condensate pipe is frozen, thaw it following safe guidance (warm water), but do not attempt internal repairs.

5) Check mains power and display: Ensure the boiler has power and the display is active. Note any additional fault indicators or LED flashing patterns.

6) Check system pressure: Ensure boiler system pressure is within the normal range (typically around 1.0–1.5 bar). Low pressure can cause unrelated lockouts but is worth confirming.

If basic checks do not clear the fault, what to report to an engineer and what they will typically check:

1) Describe actions taken and repeatability: when the error appears, whether the fan makes any sound, whether reset temporarily clears it, and any recent events (power cuts, storms, service history, warranty).

2) Accessible visual checks only: an engineer will inspect the fan wiring connector for corrosion or a loose plug, check for debris or seized fan blades, and test whether the fan motor receives the start voltage from the PCB.

3) Fan motor test and replacement: the engineer may remove the fan assembly to check bearings, motor continuity and rotation. A seized or worn fan motor is a common replacement item.

4) PCB and control diagnosis: if the fan is electrically sound and receives correct signals but does not report running, the control board or fan tachometer/feed may be faulty and require repair or replacement.

5) Other checks: the engineer will check for related sensor faults or wiring faults that might cause the controller to think the fan is not running, and check the flue thermostat or safety devices if applicable.

Important: repeated resets that temporarily clear C7 are not a safe long-term fix. Because the fan and control circuitry are part of the boiler's safety chain, arrange a visit from a qualified Gas Safe engineer if the fault persists, reoccurs, or if you are unable to identify or clear a simple external blockage. If the boiler is under warranty, contact Worcester Bosch or your installer before any parts are replaced. Do not attempt internal electrical or gas work yourself.