Just a quick note to record the changes we made to the burner, following the failures on Windermere and Ullswater.

The conclusion was that these failures were mostly heat related. But also we fitted three new control boxes to the burner before we found one that worked!!…

The solutions were:

• Fit a heat absorbing blanket to the outside of the boiler casing to reduce the radiated heat impacting the burner.
• Fit an external duct to cause the intake air to be drawn via the control-box and ignition transformer assemblies (to help cool them)
• Strip and rebuild the burner, fitting new magic eye, solenoid, control box, ignition transformer, motor capacitor and a somewhat worn pump drive coupling.

As noted in an earlier post, this seems to have done the job, so here are some pictures:

Burner with duct disassembled. Original intake on left, new intake on right, with sound-deadening foam

Burner with duct disassembled. Original intake on right, new intake on left, with sound-deadening foam

Assembled Air duct on re-built burner

Burner on stand ready for testing