Error E92

Safety first

- If you smell gas, leave the building immediately, do not operate electrical switches, and call the national gas emergency number. Do not attempt any repairs.

- If the boiler shows an error and is locked out, avoid repeated reset attempts. One controlled reset is acceptable; multiple resets can hide a developing safety issue or damage components.

Initial homeowner checks (simple and safe)

1. Note the full code and circumstances: write down E92 plus any other displayed codes, when it began (after power loss, after a service, during commissioning, etc.). This helps the engineer.

2. Check for obvious flue/terminal obstructions: go outside and visually inspect the flue terminal for bird nests, leaves, or debris. If you see a blockage you can carefully remove loose debris externally, but do not insert objects into the flue.

3. Check gas supply: confirm the gas meter is on and any prepayment meter has credit. If you suspect no gas supply, contact your gas supplier.

4. Check system water pressure: look at the pressure gauge (aim 1.0–1.5 bar for most domestic systems). If pressure is very low (<0.5 bar) top up via the filling loop if you are comfortable doing so and your user manual describes the procedure. Only do this once, then recheck the fault.

5. Reset once: follow the manufacturer reset method (usually hold the reset button or selector in the R position for ~5–10 seconds). After a single reset, observe whether the boiler attempts to run and whether E92 returns.

Specific diagnostic and safe next steps

1. If E92 clears after reset and the boiler runs normally for some time, monitor closely. If it reappears, stop resetting and arrange an engineer visit.

2. If E92 persists after the checks and a single reset: do not attempt internal repairs. This fault is normally caused by combustion/calibration issues which can be due to a blocked flue, faulty fan, incorrect gas pressure, poor flame sensing, or a PCB/calibration fault. These require specialist testing (flue gas analysis, fan and gas valve checks, electrode and flame-sensing tests) and recalibration during auto-setting.

3. If your model documentation or a service manual suggests E92 could indicate a water pressure sensor fault on your specific GA variant, advise the engineer of this possibility. The engineer will test the sensor and pump if required.

4. Prepare for the engineer: switch off the boiler only if instructed by the engineer or if you need to make the property safe. Have the boiler model, serial number, the exact code, and notes of what you checked ready. Record whether the fault appeared after service, power outage, or replacement parts.

When to call a professional

- Contact a Gas Safe registered heating engineer if E92 does not clear after the single reset and the basic external checks, or if you are unsure about any step.

- Combustion test failures and any flue, fan, gas valve or flame-sensing faults are specialist work. The engineer will have a flue gas analyser and the knowledge to check combustion, recalibrate settings, test the fan and gas pressures, inspect the flue and replace sensors or parts if needed.

Final notes

- Do not attempt to access or modify gas or combustion components yourself.

- Avoid repeated resets; one reset for diagnosis is acceptable but repeated lockouts require professional attention.

- If uncertain, or if you detect gas smell, have no gas supply, or see obvious flue damage, treat it as an emergency and call the appropriate emergency services and a Gas Safe engineer.