Error E134

Safety precautions:

- If you smell gas evacuate the building immediately, do not operate electrical switches, do not light flames, and call the gas emergency number straight away. Inform everyone in the property to leave.

- Before touching the boiler controls, switch off electrical power to the boiler at the isolator and, if you have a meter or external gas isolation valve, do not operate internal gas parts other than the external isolation valve.

- Do not attempt internal repairs, remove the case, or work on the gas pipework unless you are a Gas Safe registered engineer.

Initial homeowner checks you can safely do:

- Check other gas appliances in the property (hob, gas fire) to confirm the gas supply is present. If none work, the fault is likely at the meter/supply and you should contact your gas supplier.

- Check any gas isolation valve at the boiler pipework is in the open position (usually parallel to the pipe). If it was closed, open it and try a boiler reset.

- Check prepayment meters for credit or timer controls on the meter that may have cut supply.

- Note any other fault codes displayed, the frequency of the fault, and whether it happens on hot water, heating, or both.

- Try a single reset of the boiler: press and hold the reset button for 5–10 seconds and allow the boiler to attempt restart. Do not keep resetting repeatedly if it immediately returns to fault.

Specific diagnostic and fix steps (what an engineer will do and what you should arrange):

- If basic checks above show the gas supply to the property is fine but the fault persists, contact a Gas Safe registered engineer. Provide them with the exact error code (E134), how often it occurs, and any other displayed codes or symptoms.

- The engineer will perform safe gas checks: verify working gas pressure at the boiler with a manometer/analyzer, check gas inlet conditions (appliance isolation valve, meter pressure), and confirm the boiler can reach the required working pressure for ignition.

- The engineer will check electrical communication between the boiler PCB and the gas valve, verify the gas valve is operating correctly (servo/solenoid action, continuity), and check for stuck valves or internal valve failure. They will also inspect ignition electrodes, flame sensing leads, and the condition of the combustion chamber for water or contamination that might prevent reliable ignition detection.

- The engineer may check for short cycling or rapid repeated call-for-heat caused by thermostat or control wiring faults (e.g., a short request in a short period) and will inspect room or cylinder thermostat wiring and programmer controls.

- The engineer will investigate related causes such as blocked condensate pipes or water in the heat exchanger only if those symptoms are present, and will clear blockages or drain condensate safely if needed.

- If a component is found faulty (gas valve, PCB, flame sensor, wiring), replacement or repair should be performed by the Gas Safe engineer. After repairs they will test for safe operation and gas tightness.

When to call a professional and what to tell them:

- Call a Gas Safe engineer if the initial checks do not restore normal operation, if the boiler locks out repeatedly, if you detect any smell of gas, or if you are unsure about any check. Provide the engineer with the boiler model (Baxi 600 Combi), serial number if available, the exact error code E134, how long and how often it appears, and what you have already checked.

- Do not keep resetting the boiler repeatedly as this can mask the underlying problem and may cause further damage.

Remember: anything involving gas valves, internal wiring, ignition systems, or PCB work must be done by a Gas Safe registered engineer for your safety and to comply with regulations. Keep records and photographs of the error code to help the engineer diagnose the fault more quickly.