Where have I gone wrong? Bathroom light/fan

[AndyPRK]

What terminals have you used in the other switch then ?

 

[mrchow]

Com and L1

com is live
L1 is switched live

 

[terryplumb]

Does the fused connection unit also have a switch ?
Simple checks with a multimeter will determine what's wrong.

 

[mrchow]

Cool, yeh will buy a multi meter and check.

the wires are relatively easy to remove so might recheck everything first.

I’ve not used a multi meter before - but will figure it out. If there’s anything should look for let me know

 

[mrchow]

And yes the fused unit has a switch - just standard fused switch with a 3 amp fuse inside

 

[terryplumb]

You could show us pictures of all the connections at the FCU terminals ,switch terminals ,transformer / fan terminals etc .
If that doesn't show any issues ,the next step would require using the multimeter on LIVE circuitry to take voltage readings at various points.

 

[mrchow]

Yeh, I’m back there on Sunday so let’s see - will remove wires first and re check it all. After seeing Comments I think I’ve probably labelled a wire incorrectly.

will take pictures on Sunday if I still have issues of all connections

 

[mrchow]

so it’s all fixed... looks like I made an amateur mistake... labelled the wires incorrectly on two of the wires. Circuit worked all fine once fixed