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 Turns out one of the 2-way switch is faulty. That one is less than two years old. I thought switches would last at least 20 years. Thanks to everyone who helped.

I have unscrewed two fixtures. Both of them have only two wires. None of the lights works. I searched the net and found at least three different ways of connecting an intermediate switch but the one you showed uses the least amount of wire as one of the 2-way switch is six meters to the left and...

Just want to clarify one thing. The terminal at the upper-right hand corner of S1 should connect to the terminal at the upper-left hand corner of the intermediate switch, right? As it is in the diagram, the two terminals are not connected.

Frankly, I can't imagine how the fitting wiring can go wrong. As depicted in Hudson's diagram, there are only two wires for each light, one in, one out. Even if they are connected reversely, the light should still work.

By "fixed reference", do you mean the same reference is used for voltage measurement? In other words, should I measure the voltage between a wire and that same reference? Seems I need a long wire to reach the two 2-way switches. OK. I'll re-measure the voltages tomorrow.

You are right. I'm not in UK. I'm in Burma. Thanks for the reply. Here, all the switches has only hot wires (how do you call that in UK?). There is no neutral and no grounding wires. I'll measure the voltages again if I can find a grounding wire nearby. But then, how do I tell if the grounding...

I have four lights in a hallway. They are controlled by 2 2-way switches and 1 intermediate switch, which is in the middle. The circuit is not working, after I hired a contractor to replace ceiling. I disconnected all four wires from the intermediate switch and then checked the 2 2-way switches...