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Vokera Pinnacle System fault E091

Primary heat-exchanger cleaning fault

Gas boiler

What it means

The boiler's auto-diagnostic system signals the need to clean the primary heat exchanger based on total number of hours in certain operating conditions. Occurs when the hour meter exceeds 2500 hours.

Likely causes

  1. Flue gas probe hour meter exceeding 2500 hours
  2. Heat exchanger requiring scheduled cleaning
  3. Deterioration or damage of burner insulating panel
  4. Scale and combustion deposit buildup on heat exchanger coils
  5. Dirt residue inside heat exchanger reducing efficiency

Where to start

  1. Access System Info menu to display value of flue gas probe meter (display/100, example 2500h = 25)
  2. Verify hour meter value against 2500 hour threshold
  3. Visually inspect retarder insulation panel for damage

The full answer, free

  • 14 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 6), 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 Pinnacle System. Check the model on the data plate before you order parts.

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