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Eo2 lockout problem with my weil McLain ultra 105 series 2 boiler. I believe it is the flame sensor as I have no problem with the ignitor. Any suggestions? The boiler goes into lockout periodically and has to be reset.

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3 Suggested Answers

SOURCE: My oil boiler is a

The actual final solution was to replace the fuel valve/solenoid following which the boiler has run without failure.
The conclusion was that the fuel valve solenoid was ok when cold but when heated up had some sort of electrical breakdown in its coils, causing the fuel valve to fluctuate until the boiler locked out.

Posted on Oct 17, 2008

  • 108 Answers

SOURCE: I have a weil-mclain CGA-4-SPDN

You need to replace the Thermocouple. (pilot safety device) It would be best to call a Technician about this.

Posted on Oct 22, 2008

  • 833 Answers

SOURCE: How to replace collapsed fire

Your heating supply store will have a replacement unit.  I do suggest you get a pro to do this, however.  Your burner should be tuned and this is not a job for an amateur.

Posted on Nov 15, 2008

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