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135

Error 135 - Internal Gas Supply Interruption

Baxi · Duo-tec 2 Combi GA Boilers

What does 135 mean?

This error code indicates an internal interruption in the boiler's gas supply system. The boiler's display will show the spanner symbol and the numeric error code, signifying an internal fault.

Common Causes

  • Internal gas pressure switch fault
  • Problem with the boiler's gas manifold or internal pipework
  • Control board malfunction

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

    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
Open Manual (Page 9)Search more codes in this manual