Odd PIR Sensor Fault

[styleprop]

Hi all

Thanks in advance for any help.

My rear security light kept going on and off, even though nothing was moving.
So I replaced it with a new one and it's doing the same thing!
I replaced the fused spur too, and it's made no difference.

Could it be a power issue? I've got no other electrical problems and I had all my electrics checked about 2 years ago.

Cheers, any help would be appreciated.

 

[EFLImpudence]

Does it just flash on and off or stay on for the set time?

 

[styleprop]

It stays on for the set time.

 

[EFLImpudence]

It;s supposed to do that when the supply is restored (after being completely off) so it could be a loose wire somewhere.

Does any wiring blow around in the wind?

 

[sparkymarka]

Is it near your boiler flue …

 

[styleprop]

There's no loose wiring on show, and there was no wind when I changed the fused spur.
It's not near the flue either.

Did you say it's supposed to keep clicking on at first?

 

[AndyPRK]

Facing trees moving or hot objects.

Cover half the pir window (with black tape) or face down and see if that helps.

Completely Cover window to disprove it’s a power issue.


When I turn off an old fluorescent I’m sure mine sometimes comes on.

 

[EFLImpudence]

Did you say it's supposed to keep clicking on at first?

Not exactly, but if the PIR is isolated - switch off FCU (if wired correctly) then when switched on again the light will come on for the set time.

 

[styleprop]

I covered the sensor and nothing changed. It goes off for between 1 and 5 seconds then comes back on.

 

[styleprop]

Sounds like it's nothing to do with the light fitting anyway, especially as I replaced it with a new one and nothing changed.

I'll probably have to get a spark to check the wiring etc.

Thanks guys!

 

[EFLImpudence]

Well, it would be a coincidence but - many an hour wasted on faulty new products

 

[sparkymarka]

Take it down and fit a cable with a plug on it …..plug it in the house and see if it does the same ….if so ….its faulty

 

[styleprop]

I was hoping I could fix it, but now I’m in touch with a spark. I think it needs hands on from an expert…

Thanks for the replies, they did help