Baxi 105 HE boiler flame fault, runs for 10s,

Oct 27, 2019 Last reply: 6 years ago 3 Replies
D

The "no flame" neon indicator is flashing (suggests flame failure or condensate drain blockage).



The condensate drain is not blocked.



If I reset the boiler, and get it to restart, then running a hot water tap or turning on the central heating starts up the flame and fan.



If there is demand, the flame


  • comes on
  • cuts out after 10 seconds
  • comes back on after about 25 seconds
  • cuts out after 10 seconds
  • comes back on after about 25 seconds
  • cuts out after 10 seconds

... and then the boiler goes back into fault mode.



The repair manual suggests that the PCB could be the issue; in fact I replaced that a few years ago, but I can't remember whether it was the same fault.



Any immediate ideas?



Daniele


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T

Ignition detection fault? It?s possibly going through a cycle of ignition attempts not detecting that the flame has lit.

If it has flame detecting electrodes, sometimes a clean/tweak of the electrodes will restore flame detection.

Tim

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J

Make sure the earth connection in its power supply is good as well - many will use flame rectification for flame sensing, and that needs an earthed chassis.

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D

However, I seem to have fixed it by removing the condensation tank, and drying it, particularly near where the sensor wire is connected to it. I think that it was damp, and sufficient current was leaking to trigger the fault indication.

Daniele

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