Dimmerlinc fails by cycling between on and off

[hart2hart]

Over the years, I’ve had a few dimmers that fail by going through a cycle of on and off repeating every few seconds up to 20ish seconds. I’ve done usual factory reset and resend programming. If any thing, early in issue leaving it off for some time makes it better for a time — maybe heat sensitive but so few times I can’t really confirm that pattern. Also, most have been several years old. In good old days, I just replaced without a second thought and didn’t pay as much attention.

 

Had one on Friday and I’ve replaced it with a spare. Any thoughts on what I’d need to repair it electronically.

[Techman]

What type of loan is the dimmer connected to?

If you disconnect the load and watch the dimmer status in the admin console does it still show that the status changes from on to off?

Do you have any programs controlling the dimmer that could be in a loop?

 

Edited November 5, 2022 by Techman

[hart2hart]

In this case, the specific switch is a member of a three way scene and doesn’t directly control a load. The eventual load is a ceiling fixture with LED bulbs. You can communicate with the dimmer. I’ve got switch wired into a plug in harness to see if it does it outside scene and electrical box.

The last time it happened, it was incandescent bulbs in exact same 3 way config. Don’t recall for certain but believe it was switch that controlled the load.

[hart2hart]

No programs in any case where it has occurred and using replace device in ISY has always fixed it.

[headless]

I have successfully repaired several 2476Ds that were ramping up and down by replacing the following capacitors:

 470uf 35V Electrolytic Radial Capacitor  

100uF 16V Electrolytic Radial Capacitor  

Edited November 11, 2022 by Cary

[apostolakisl]

I have also fixed several 2476D's by replacing caps.  I can't tell you which caps, by and large, I just replaced nearly all of them provided I had an acceptable replacement sitting around.  The trick with them is you have to drill out the rivet holding the heat sink.  Then you have to re-rivet it when complete.  The issues included failing to boot up, or taking a really long time to boot up and buzzing while booting up, and issues with turning on/off.  I don't recall any that just randomly ramped up/down.

[hart2hart]

Thanks, all. It’s a 2476D with date code 0930. Gonna throw it in broken box for now since it looks like we’re in Insteon business for at least a few more years.