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Vokera Vibe fault A90

Flue gas probe fault

Gas boiler

What it means

Transitional alarm indicating a fault with the flue gas probe/sensor.

Likely causes

  1. Flue gas sensor/probe fault
  2. Faulty flue gas probe
  3. Wiring fault to flue gas probe
  4. Flue components incorrectly assembled, fixed or supported
  5. Flue or flue terminal obstructed
  6. Degraded seals around appliance burner, internal flue seals, door and case seals
  7. Mixing of combustion products and inlet air due to flue integrity failure

Where to start

  1. Press reset button for more than 2 seconds to attempt restart
  2. Insert fumes analysis probe until it reaches the stop
  3. Enter combustion analysis mode (press and hold >2 sec), display shows 'Co'

The full answer, free

  • 30 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 28), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Vokera manual for the Vibe. Check the model on the data plate before you order parts.

Other Vokera Vibe fault codes