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Immergas Victrix fault FU

Fixed speed fan test

Gas boiler

What it means

Special function used to activate the fan at a fixed speed for flue/air intake system verification during installation.

Likely causes

  1. Lack of water in the appliance
  2. Little water circulation in the system
  3. Blocked pump
  4. Blocked pump (Par. 1.29)
  5. Combustion air contaminated with chlorine, sulphur or powders
  6. Chemical substances stored in the installation area
  7. Installation in beauty salons, paint workshops, carpenter's shops, cleaning companies without a separated combustion air supply
  8. Combustion air fed through chimneys previously used with liquid/solid fuel boilers, causing soot accumulation

Where to start

  1. Ensure condensate drain trap has been filled correctly before performing the test
  2. Check there are no obstructions in the air intake circuit and flue exhaust
  3. Check that the sealed chamber is perfectly closed

The full answer, free

  • 49 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 80), 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 Immergas manual for the Victrix. Check the model on the data plate before you order parts.

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