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Vokera Vibe fault E091

Heat exchanger cleaning required (unusual usage threshold)

Gas boiler

What it means

The appliance incorporates software that monitors operating conditions and records 'unusual usage conditions' that affect the requirement to remove and clean the burner/heat exchanger assembly. When the unusual usage hours reach a pre-determined threshold, the appliance signals via alarm code E091 that the heat exchanger requires cleaning.

Likely causes

  1. Unusual usage conditions accumulated over time reaching a pre-determined threshold
  2. Burner/heat exchanger assembly requiring cleaning
  3. Damaged or worn burner insulating panel

Where to start

  1. Check alarm history via UI menu for E091 occurrence
  2. Remove the burner insulating panel (D) by inserting a blade underneath the surface
  3. Remove any fixing glue residue

The full answer, free

  • 24 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 35), 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