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Help on replacing light switch

DublinWriter · 2010-05-03 13:10:28

We have a faulty switch on a 2-switch plate for the downstairs toilet (light & fan). I bought a 2-way double switch unit from B&Q, but on the new unit there's L1, L2 and COM and on the old unit there's L1, L2 and L3. The L3 positions aren't wired to anything in the old unit. I tried replicating the L1 and L2 wiring…

03-05-2010 2:10pm

#1

DublinWriter

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Join Date: June 2004

Posts: 9065

We have a faulty switch on a 2-switch plate for the downstairs toilet (light & fan).

I bought a 2-way double switch unit from B&Q, but on the new unit there's L1, L2 and COM and on the old unit there's L1, L2 and L3.

The L3 positions aren't wired to anything in the old unit.

I tried replicating the L1 and L2 wiring assignments in the new unit but it didn't work.

Anyone know what the wiring assignment would transpose to on the new L1, L2 and COM unit? I think it's...

Old L1 -> New Com
Old L2 -> New L1
Old L3 -> New L2

...but I'm not too sure.

Any help would be greatly appreciated.

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Comments

#2 03-05-2010 2:17pm

Philistine

Registered Users Posts: 159 ✭✭

Join Date: June 2006

Posts: 141

use com and L1

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#3 03-05-2010 5:11pm

meercat

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Join Date: November 2009

Posts: 4657

old L1 goes into com
loop a wire into the other com also
connect fan into L1
connect light into other L1
make sure power is off when working with electrics

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