Downstairs Mains RCBO Tripping

[Distorted Vision]

Today I replaced the outside PIR sensor the floodlights that are on the front of our house.
I believed it was defective because the floodlights were staying on when the 2 gang switch was set to sensor.
The issue actually persists.

After completing this job the downstairs mains sockets RCBO keeps tripping. I have unplugged all the downstairs appliances.
The floodlights are on the 'Outside Lights' circuit. I thought it was a coincidence and unrelated as the downstairs mains ring is on a RCBO on the high integrity part of the consumer unit.

Any suggestions before I call an electrician?

[Distorted Vision]

I think the RCBO is defective.

[Someone-Else]

I think the RCBO is defective.

Why do you say that?

If nothing tripped before you changed the lights, and now something does trip after you changed the lights, it is very likely something to do with what you have done.

Have you done, moved or checked anything else?

[Distorted Vision]

I didn't change the flood lights I changed the PIR sensor on the outside wall. The downstairs ring main is on an RCBO on the high integrity section of the consumer unit. The outside lighting is on a MCB. Two completely different circuits.

[Distorted Vision]

Could the issue with permanent on be cause because I swapped the switched live and permanent live?

[Someone-Else]

Could the issue with permanent on be cause because I swapped the switched live and permanent live?

What else did you do? (and I do mean anything)

[Distorted Vision]

I have a local electrician coming in the morning. Will report back tomorrow.

[Neelix]

A fault on another circuit CAN affect affect the RCBO.

I would disconnect the PIR to rule it out

[ericmark]

I would guess some where some one has used a green/yellow wire for some thing which is not earth. And so resulted in the problem, the

The downstairs ring main is on an RCBO on the high integrity section of the consumer unit.

if I am reading it correct rings alarm bells, why have a RCBO on the RCD side of the consumer unit, but that may not be what you mean by "high integrity section"? I never did work out why consumer units were called high integrity.

[Distorted Vision]

Electrician has been. RCBO was defective.