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09

09 — Gas valve connection error

Baxi · Duotec+ GA Compact Boilers

What does 09 mean?

The boiler's electronic board is having trouble communicating with or controlling the gas valve. This can prevent the burner from operating.

Common Causes

  • Loose connections between the gas valve and the electronic board
  • Faulty wiring
  • A problem with the gas valve itself

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press and hold down the Reset button for 2 seconds to try clearing the fault.

  2. 2

    Ensure the boiler has a stable power supply and the main gas tap is open.

  3. 3

    If the fault persists, contact an Authorised Service Centre for inspection of connections and components.

Browse all codes in this manual (37)
Verified technical data. Last updated: April 2026

Related Faults

1010 — External probe sensor faulty109109 — Air in boiler circuit (temporary fault)110110 — Safety thermostat tripped due to overtemperature
Source: Baxi Duotec+ GA Compact Boilers
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