Error F7 328

Safety first

1) If you smell gas: evacuate everyone from the property, do not operate light switches or phones near the smell, turn off the gas supply at the meter if you can do so safely and call the gas emergency number immediately.

2) If you don’t smell gas, treat the boiler with caution. Do not remove the boiler casing or attempt internal repairs unless you are a qualified Gas Safe engineer.

Initial checks a homeowner can do

1) Note what’s shown on the display (F7 328) and whether a warning triangle or a lock icon is flashing. Take a photo or write the code down.

2) Check the mains power: are other sockets/appliances in the house working? Check the consumer unit (fuse box) for any tripped breakers or blown fuses and reset if safe to do so.

3) Check the boiler’s external flue terminal (outside) for obvious blockages: bird nest, leaves, snow/ice. Do not crawl into confined spaces; check only what is safely reachable from the ground.

4) Check for condensate/pipe freezing if temperatures are low (less likely for F7 but useful for general ignition faults).

Basic restart and diagnostics (homeowner)

1) Try a standard reset: follow your manual for the GB162 — typically press and hold the reset button or press the spanner/return to access the reset function for about 3 seconds. If the boiler has a separate reset procedure, follow the printed instructions on the unit. Do not repeatedly press reset more than twice if the fault returns.

2) If reset does not clear, perform a power-cycle: switch the boiler off at the isolator or consumer unit, leave off for 30–60 seconds, then turn back on and attempt a restart.

3) Re-check the display. If F7 clears and the boiler runs normally, monitor the system for recurrence. If the fault returns within a short time, do not continue to reset — this indicates an underlying fault.

4) Access the information menu (spanner/return button) and read the cause code list if available. Note date/time of the fault and any preceding power interruption (e.g., lights flickered earlier).

What a professional will check (do not attempt yourself)

1) A Gas Safe engineer will inspect for flame-sensing faults: check/clean/replace ignition electrodes and the flame sensor, and check probe wiring and connections for corrosion or water ingress.

2) They will test the PCB and its supply rails for signs of damage from power surges and verify wiring and earth connections. They may run diagnostic logs and check the stored cause code (328) history.

3) They will check the gas valve behaviour and perform gas tightness/leak tests if there is any suspicion of valve leakage or abnormal flame signals.

4) They will inspect the flue and air supply, and test fan operation and pressure/airflow if relevant.

5) If required the engineer may replace the PCB, ignition electrode, sensor, or other components — only a registered engineer should carry out these repairs.

When to call a Gas Safe engineer immediately

1) If you smell gas. 2) If the boiler locks out repeatedly or the F7 returns after resets. 3) If there are additional error codes, warning triangle/lock icons, or any signs of water ingress, burning smell, or visible damage. 4) If you are unsure what caused a recent power outage that coincided with the fault.

Notes and practical advice

1) Record times and frequency of the fault, any power interruptions, and any symptoms (no heat, no hot water, noise). This helps the engineer diagnose. 2) A single brief F7 after a known power cut can sometimes be cleared by a single correct reset; repeated faults point to a component or wiring issue. 3) Do not continue to attempt internal repairs or swap electrical parts yourself. Contact a Gas Safe engineer to carry out safe diagnostics and repairs.