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Vokera Vibe fault A40

Fill the system

Gas boiler

What it means

Definitive alarm indicating system water pressure has remained below the 0.3 bar safety value for longer than the 10 minute transitory period of A41.

Likely causes

  1. System pressure below 0.3 bar safety value persisting beyond 10 minutes
  2. Water leak in system
  3. Frequent pressure drop indicating a leak
  4. Low system water pressure
  5. Water leak in heating system
  6. Failed transition from A41 after 10 minutes
  7. Leak in heating system
  8. Faulty seal or joint

Where to start

  1. Open the filling valve slowly until water is heard entering the system
  2. Close the filling valve
  3. Access Info menu item I018 to check pressure value reaches 1-1.5 bar

The full answer, free

  • 6 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