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Ideal Logic System IE Gen 2 fault F03

Fan fault

Gas boiler

What it means

Fault related to the fan operation, requires diagnostic procedure in Section 4.7.

Likely causes

  1. CO/CO2 ratio greater than 0.004 indicating combustion deposits or fouling
  2. Debris or deposits in heat engine/sump outlet
  3. Damaged electrode affecting combustion
  4. Condensate trap blockage or drying out
  5. Combustion deposits building up on heat exchanger
  6. Debris in sump outlet or condensate trap
  7. Damaged or worn electrode affecting spark gap
  8. Water or gas joint leakage

Where to start

  1. Light the boiler and carry out pre-service check, noting operational faults
  2. Check flue terminal (and terminal guard if fitted) is undamaged and clear of obstruction
  3. Connect flue gas analyser to flue gas sampling point and measure CO and CO2 at maximum rate, then repeat at minimum rate

The full answer, free

  • 23 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 49), 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 Ideal manual for the Logic System IE Gen 2. Check the model on the data plate before you order parts.

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