Error 2924 V

Safety precautions:

1. If you smell gas, do not touch the boiler. Turn off gas at the meter if safe to do so, ventilate the area, evacuate occupants if needed, and call the gas emergency number immediately. Do not attempt repairs.

2. Do not attempt to replace or adjust the gas valve, control board components, or internal wiring unless you are a Gas Safe qualified engineer. Working on gas appliances or live mains wiring is dangerous and illegal for unqualified persons.

3. Isolate electrical power to the boiler for any internal visual checks and only remove external covers if you are comfortable doing so and power is off.

Initial homeowner checks (safe, basic checks you can do):

1. Record the fault code and any conditions (time, if boiler was mid-cycle). Take a photo if helpful for the engineer.

2. Try a single reset using the boiler reset button, then request heating or hot water and watch closely. If the fault does not return, monitor for recurrence. Do not keep resetting repeatedly.

3. Check the mains electrical supply to the boiler (is the fused spur switched on, have other appliances lost power?).

4. Check that the gas supply to the property is on and that other gas appliances are working. If you suspect a gas supply issue, contact your gas supplier.

5. Check visible external wiring and connectors to the boiler for obvious damage or loose plugs (do not open sealed compartments). Note any loose plugs and report to the engineer.

Specific diagnostic steps an engineer will perform (do not perform unless qualified):

1. Verify fault history and attempt a controlled reset and burner start to reproduce the fault while observing voltages and signals.

2. Check the wiring continuity and integrity between the control PCB and the modulating gas valve, including plugs, crimps and connectors. Repair any damaged wiring.

3. With appropriate isolation and test equipment, measure the drive signal from the control board to the gas valve during modulation (this may be a relay drive or an analogue/modulating command depending on valve type) and verify that the gas valve receives the correct supply.

4. Measure the feedback signal or contact from the gas valve back to the control board. Confirm whether the valve is providing the expected position/feedback signal or whether the relay contacts are changing state.

5. Test the gas valve electrical coils/actuators for correct resistance/operation as per manufacturer data. Check for internal leakage tests or EV1/EV2 leak indications if fitted.

6. If the control board relay or driver is suspected faulty, test the PCB outputs and relays. Replace the PCB or relay module only if testing confirms a board fault.

7. If wiring and PCB are good but no feedback is present when the valve is driven, the gas valve is likely defective and should be replaced with the correct Worcester Bosch approved part. After replacement, commission and test the appliance to manufacturer settings and run leak checks and combustion checks.

8. If a new valve is fitted, the engineer will also check for any upstream issues (gas supply pressure, filter, isolation valves) and run full combustion and safety checks, plus verify that the feedback loop functions over the modulation range.

Important notes and final recommendations:

1. This fault affects the gas control safety chain. Do not bypass safety interlocks or operate the boiler for prolonged periods if the fault persists.

2. If the fault returns after a reset, the most common outcome is that the gas valve or the valve relay/driver needs replacement. Replacement and commissioning must be done by a Gas Safe registered engineer.

3. If you are unsure or uncomfortable at any point, stop and contact a Gas Safe engineer. Always prioritise safety over trying further DIY troubleshooting.