Bentone Sterling 35 oil burner cycling

30 Oct 2008
Reaction score
United Kingdom
Hi all,
For the last year our oil CH has sat idle as we also use an Aarow wood stove/boiler piped into the same system and controlled by 3 way valves. (Old Myson boiler block with newer Bentone sterling burner fitted) When oil was last used in Feb/Mar it didn't seem to be running as effective for heat output but would run continuously . Now when we fire the oil boiler up, it is cycling the oil feed on/off. The flue/boiler don't get anywhere near as hot as they should. Air fan is running constantly as it should, the burner will then cut in for perhaps 15 secs then shut off for 5 secs then repeat. The satronic TF830 module isn't going to lockout but is obviously detecting some fault condition....but what?

The oil pump pressure and airflow hadn't been altered although after marking the orig positions and experimenting with increased/decreased flows for both didn't alter the cycling but did change the burner sound and produced black instead of white smoke/vapour at one point. Oil flow is good, and the airways/flue are clear etc.

I haven't stripped down the burner nozzle etc but it does look clean. One of the retarder plates in the boiler had fallen into the bottom, I have now cleaned out the interior and refitted the plates correctly.
LAst week when the heating was left for 1/2hr cycling on/off the Danfoss EBI ignition unit failed with a melted side/burning smell. Replaced the module and the cycling is still there.

Is the cycling causing extra workload for the ignition unit and likely to have caused that to fail? or is this just a coincidence? Does the ignition spark continuously in normal use or just initially to get ignition?

The photocell looks ok, but if faulty would that cause this symptom?

There is precious little technical around on the net for Bentone burners, the fault finding I did find re: cycling, suggests an airflow/burner mix problem, so just wanted to get the benefit of anyones experience before stripping the burner nozzle etc down.

Thanks for any suggestions

Bilko (Sgt)
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