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Vokera Vibe fault A91

Reset operating hours counter (related to fault A91)

Gas boiler

What it means

Used to reset the flue gas probe operating hours counter in certain conditions, specifically referenced for fault A91. Bring the value to 1 to reset the flue gas probe hour counter after the cleaning of the primary heat exchanger. The parameter returns automatically to 0 once the reset procedure is complete.

Likely causes

  1. Primary heat exchanger operating hours counter (parameter checked at I015) has exceeded 2500 hours threshold
  2. Operating hours counter exceeded 2500 hours in certain operating conditions indicating heat exchanger needs cleaning
  3. Primary heat exchanger requires cleaning, triggering hour counter related fault A91

Where to start

  1. Check Info menu item I015 to view hours counter (value displayed divided by 100, e.g. 2500h shown as 25)
  2. Clean primary heat exchanger using special kit accessory
  3. Isolate the appliance from the gas & electrical supply

The full answer, free

  • 21 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 31), 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