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Ideal Logic System IE fault L0D

Ignition lockout: blocked flue/condensate

Gas boiler

What it means

Boiler has locked out on ignition failure attributed to blocked flue or condensate system.

Likely causes

  1. Blocked flue
  2. Blocked condensate pipe/trap
  3. Flue components not correctly assembled, fixed or supported
  4. Flue or flue terminal obstructed
  5. Displaced seals on flue extensions allowing combustion products and inlet air to mix
  6. Seals on flue extensions displaced during installation
  7. External wall seal dislodged if Mark 1 is not flush with inner wall surface and can be seen prior to the wall surface

Where to start

  1. Refer to Section 4.3: Ignition Lockout procedure
  2. Set boiler to maximum gas rate and allow combustion to stabilise (do not insert analyser probe during this period to avoid flooding sensor)
  3. Insert analyser probe into air inlet test point (where available) and allow readings to stabilise - flue integrity check

The full answer, free

  • 89 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. Check the model on the data plate before you order parts.

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