Error 2925 V

{ "ai_overview": "The 2925 V error on a Worcester Bosch Greenstar 8000 means the control electronics are receiving a feedback signal from the modulating gas valve that is too low. The boiler uses a feedback voltage or signal from the gas valve to confirm the valve position and that gas delivery is being correctly modulated. If that signal is missing or below the expected range the control shuts down or locks out as a safety measure because it cannot confirm safe, correct gas flow for combustion.\n\nThis fault can be caused by a faulty modulating gas valve, a failed gas-valve relay or driver on the burner control module, damaged or loose wiring/connectors between the control board and the gas valve, or a problem in the boiler’s control electronics. Severity is moderate to high: it prevents normal firing and is a safety-related fault affecting gas control. For most homeowners this is not a DIY repair — you can perform a few safe checks and a reset, but any inspection or work involving the gas valve, wiring inside the boiler, or replacement parts should be carried out only by a Gas Safe registered engineer.", "troubleshooting": "Safety precautions:\n- If you can smell gas, stop immediately, do not operate electrical switches, ventilate the area if safe to do so, leave the property and call the gas emergency number (national gas emergency service) right away. Do not attempt any checks.\n- Turn off electrical power to the boiler at the isolator before opening covers; however, do not open the appliance or attempt internal repairs unless you are qualified and Gas Safe registered.\n- If in doubt, do not proceed — call a Gas Safe engineer.\n\nInitial homeowner checks (safe, non-invasive):\n1. Note the exact error code and whether the boiler is locked out. Make a note of when it started and any recent events (power cut, service, work on the heating system).\n2. Try a single reset: use the boiler’s reset button or follow the handbook reset procedure. If the code returns immediately or shortly after, do not keep resetting — that indicates a persistent fault.\n3. Check the household gas supply: confirm other gas appliances are working and the gas meter supply is on (if other gas appliances also fail, contact your gas supplier).\n4. Check basic boiler conditions: mains power on, external controls/stat thermostat calling for heat, and system water pressure is within normal range. Report any other simultaneous fault indicators shown on the display.\n\nVisual inspection you can safely do (no internal repairs):\n1. Look at the boiler display and note any additional fault symbols or service due messages.\n2. With the boiler switched off at the isolator, check externally visible wiring to the boiler (not inside the casing) and the condition of the flue and surrounding area for obvious damage or blockages. Do not remove panels or touch internal components.\n3. If the boiler was recently serviced or worked on, confirm the service engineer returned all covers and connectors; loose external connectors can sometimes cause faults.\n\nWhat an engineer will diagnose and likely do (for your information):\n1. The engineer will safely isolate and open the appliance and measure the feedback signal from the modulating gas valve during operation (voltage or potentiometer feedback depending on valve type). They will also check the gas valve relay/driver on the burner control module and associated wiring and connectors for continuity, corrosion or burn damage.\n2. They will test the ignition and flame detection circuits to rule out related faults that can affect gas valve behaviour and verify the control board/HCM and KIM (where fitted) are operating correctly.\n3. Depending on findings the engineer may repair/replace wiring or connectors, replace the modulating gas valve, or replace the burner control unit or gas-valve driver if faulty. They will re-test and confirm safe operation after any repair.\n\nWhen to call a professional:\n- If the reset does not clear the code or the fault returns at all, call a Gas Safe registered engineer. Any work involving the gas valve, internal wiring or control electronics must be carried out by a qualified engineer.\n- Call immediately if you smell gas, detect soot, have evidence of poor combustion, or if the boiler shows multiple or escalating fault codes.\n\nInformation to give the engineer when you call:\n- Exact model and serial if available (Worcester Bosch Greenstar 8000), the displayed fault code (2925 V), when it started, whether a reset was attempted and what other symptoms exist (no heating/hot water, lockout behavior, recent service). This speeds diagnosis and helps them bring the right parts.\n\nDo not attempt internal repairs, replacements or measurements involving the gas valve or control board unless you are a Gas Safe registered engineer.