Baxi - display error E133

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There seems to be a wide divergence on here as to the most common cause.

So wide, it hardly sounds like the same boiler.
 
I have same problem with may BAXI Luna HT 1.240. After changing electrodes and cleaning every possible part boiler not started to work and error code was E133. In installer guide I found infor abou correct gaps between burner and ionisation electrode and ignition electrode. After setting correct gaps boiler started to work.
 
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I have same problem with may BAXI Luna HT 1.240. After changing electrodes and cleaning every possible part boiler not started to work and error code was E133. In installer guide I found infor abou correct gaps between burner and ionisation electrode and ignition electrode. After setting correct gaps boiler started to work.
Well done you .....
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