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cheers chaps. It does look like the cadmium sulphide type. It does seem to be responding but with higher readings. Ordered another now to substitute. Messing with it??? not me :roll: :roll:

How can you test the above photocell? It doesn't seem to be an Infra red or UV flicker sensor just a plain photocell Using it connected to a Satronic TF830 oil burner controller which is just cycling on/off- so I suspect the photocell What meter reading might one expect to read on test...

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...