Touch control lamps only works when switch wire is disconnected.

Avo Mk8 said:

Follow up!
Simple question - if you touch and continue to hold on to the sensor wire, does the dimmer behave in the same way; ie lamp stays on at the dimmest setting. Or does it do something different?

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eveder said:

Thanks Avo for your continued interest.

If I touch and hold the sensor wire, it will stay on the dimmest setting, it only changes when released and touched again….. (as it should).
Once connected to the base (or any other metal part of the lamp, it sticks at dimmest stage 1.

To compound my confusion and found out by accident, if I connect the touch sensor as normal, then lean on (touch) another double insulated lamp with a metal base, the problem lamp operates perfectly through all 3 dimmer stages and off.!!!

I have a pair of these lamps to repair and they both have the same problem.

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Avo Mk8 said:

OK, so you have shown that the sensor is behaving as we might expect if the troublesome lamp is 'loading' the sensor because of leakage or excessive capacitance.

You need the minimum of capacitive coupling between all the metalwork and L an N mains wires. Is the wire you have running in the 'stalk' of the lamp three core by any chance? I think that might be a problem.
It may also be that cable in the 'stalk' is the issue?

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eveder said:

View attachment 92691

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eveder said:

2 core to the sensor
3 core to light L N to lamp and “sensor wire” to base only

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