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This type of burner and heat exchanger is very common in Worcester Bosch boilers.

If you look carefully you can see a plate holding the three flame electrodes with a sight glass in the centre,

In this case the boiler had not been serviced for many years and the gasket behind this plate had failed, allowing hot exhaust gasses to enter the casing. 

We changed the burned wiring loom, the damaged sensors and the electrode plate and gasket.

The boiler was saved from the skip, but only just.  A few more weeks and it would have been damaged beyond economical repair.

As a matter of interest the new electrode plate no longer has the  glass window.

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This is an old Alpha storage combination boiler. The poor old thing had been ignored for many years and required major surgery to reinstate it back to being reliable, safe and efficient.

It was quite a task but another boiler fights another day! 

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