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128

Error 128 - Flame Failure

Baxi · Duo-tec 2 Combi GA Boilers

What does 128 mean?

This error code indicates that the boiler's flame has failed to ignite or has extinguished during operation. The boiler's display will show the spanner symbol and the numeric error code, preventing normal heating.

Common Causes

  • Interruption of gas supply
  • Faulty ignition electrode or flame sensor
  • Issues with the gas valve or gas pressure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the 'R' (reset) button firmly for several seconds to attempt to clear the fault.

  2. 2

    Ensure the main gas supply to the property and boiler is turned ON.

  3. 3

    Verify other gas appliances in your home are working. If not, contact your gas supplier.

  4. 4

    If the fault code reappears, contact your installer or the Baxi service division ('heateam') for assistance.

Browse all codes in this manual (28)
Verified technical data. Last updated: April 2026

Related Faults

09Error 09 - Gas Valve Connection Cable Fault109Error 109 - Pre-circulation Fault110Error 110 - Safety Thermostat Activated
Source: Baxi Duo-tec 2 Combi GA Boilers
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