2 gang 2 way switch Switch 1 on and off are reverse but Switch 2 is correct.

e12345678 · 23 May 2022

I have a 2 gang 2 way switch for 2 lights (corridor light and bathroom light).
COM1, LA1 and LA2 is for switch 1 (Bulb 1).
COM2, LB1 and LB2 is for switch 2 (Bulb 2).
Remark: Those yellow cable are yellow, so we don't know which is live wire.

When the switches are on. The bulb 2 is on but the bulb 1 is off.

When the switches are off. The bulb 2 is off but the bulb 1 is on.

The button switch 2 is correct but the button switch 1 (bulb 1) is reverse. How to make it right?

Malaysia

Johnmdc · 23 May 2022

Put the wire that is in LA2 into LA1 instead.

JohnD · 23 May 2022

2-way switches do not have an "on" or an "off" position

They have an "up" and a "down" position.

Did you ever solve your remarkably similar problem, https://www.diynot.com/diy/threads/replace-2-way-2-gang.590120/

e12345678 · 23 May 2022

Thanks all.

JohnD · 23 May 2022

In both cases, the supply wire should be in the "com"
And the output (switched live) to whichever L you prefer.

If you buy a multimeter, you can easily identify the live. But it will be the one going to Com1.

e12345678 · 24 May 2022

JohnD said:
In both cases, the supply wire should be in the "com"
And the output (switched live) to whichever L you prefer.

If you buy a multimeter, you can easily identify the live. But it will be the one going to Com1.

Hi, John,
Is the red cable in the picture you mean connect COM1 and COM2?

JohnD · 24 May 2022

Yes, I expect so.

Use your multimeter to establish which is the Live supply.

bernardgreen · 24 May 2022

JohnD said:
In both cases, the supply wire should be in the "com"

When it is a two way switch being used as a one way switch then putting the Permanent Live to the L1 ( or L2 ) terminal and the Switched Live to the COM does avoid the un-used L2 ( or L1 ) becoming Live when the lamp is switched OFF

e12345678 · 25 May 2022

bernardgreen said:
View attachment 270536

When it is a two way switch being used as a one way switch then putting the Permanent Live to the L1 ( or L2 ) terminal and the Switched Live to the COM does avoid the un-used L2 ( or L1 ) becoming Live when the lamp is switched OFF

I added color for those cable.

Are those you mean?
Purple cable LA2 move to LA1
Blue cable COM2 move to LB2
Green cable LB1 move to COM2
Red cable COM1 connect with COM2

bernardgreen · 25 May 2022

That looks to be correct if purple and blue are the Switched Lives to the lamps,

Johnmdc · 25 May 2022

Do it like that and you will be back to square 1 but with the other bulb being on instead of off.
Just do it like I told you in the first answer I gave you.
All these other people butting in and not helping!
It doesn't matter if the live is in the common terminal or not.
All the OP had to do was move 1 wire from LA2 to LA 1 and the job was done.
All your "help" has done is confuse him!!!