One of my old switches (pic attached) has recently starting randomly switching off and a few seconds later turns back on. It can be anywhere from a a few minutes to 20 to 30 minutes and it happens again. I have about 25 of these and this is the only one with this issue. I'm a LONG time Insteon user and am stumped what the problem could be.

Any ideas what could be causing this?

That's an oldy, single band. I had several them at my last house, one at the far reaches of my electrical system. They get flaky after time or power events like brown/black outs

• Try a restore device

• If that doesn't work, factory reset and and restore device

It could just be going bad, such as a bad capacitor.

17 hours ago, johnmsch said:

One of my old switches (pic attached) has recently starting randomly switching off and a few seconds later turns back on. It can be anywhere from a a few minutes to 20 to 30 minutes and it happens again. I have about 25 of these and this is the only one with this issue. I'm a LONG time Insteon user and am stumped what the problem could be.

Any ideas what could be causing this?

Now that's an oldie. Not necessarily a goodie. I didn't realize that Smartlabs was making the Togglelinc back in '06. Insteon devices from that time frame had power supplies based on a Microchip App Note 954 located here: https://ww1.microchip.com/downloads/en/appnotes/00954a.pdf

They had a habit of burning up the filter cap/zener due to powerline voltages/spikes. Another issue was with the micro switch contacts themselves.

Since the device is a relay switch, I'd guess that the 470uF cap (c2??) is breaking down (power supply drop out). You could open and inspect, but to be honest, these devices are probably at the end of their useful life. The relay units are not bad to open up (no Triac soldered to the heat sink). I still have a number in service, but when they die, will retire them.

The good news is that you apparently have very well regulated power as well as rather "clean" powerlines. Later devices incorporated dual band as well as additional simulcasting improvements.

Update - the app note I posted above is a bit misleading. It is in fact what the older Insteon supplies were "modeled" after. However the Insteon version regulated at 30V (not 5v as is the App note).

The attached schematic was developed by jbauer back in 2006. As noted, the schematic is not complete.

I found one of my malfunctioning ICON relay units from 2006 (photo's below). I had noted that the unit "cycled" when I pulled it. Unit powered up OK without a load. I disassembled and verified the supply regulated @30V as jbauer had documented.

My unit had an additional MOV (SDS 201KD07) across the power input (201V threshold). The C2 470u cap appeared to be in good condition as did the D1 30V zener diode. C1 is the large brown (Mica?) cap. I would not expect this to degrade.

That photo is for the later revision units. With the 24VDC relay. The earlier versions in the schematic had a 120VAC relay and a real small solid sate device to put a120VAC signal on the relay. Also had the two small bypass caps in series as a snubber. Across the relay contacts. They eventually shorted and the load tried to go through them. Magic smoke. Your model has a better snubber network in it.

Thanks Brian. I should have noticed that the relay in the schematic was 120V. Miss on my part. Based on the date codes, my Icon was made about 3 months after @johnmsch 's togglelinc. Hopefully they're the same layout.

Would you happen to have a better schematic of the Relay/dimmer versions in this Vintage? Understand if that is constrained by a NDA.

No I have not seen any schematics except the 2412 and 2413 PLM

On the revision you are showing. The 30V Zener is under the horizontally mounted 470uzf cap. I had one of the diodes short killing the whole thing. One thing I did find out. Both revisions have the +5VDC logic supply. Directly connected to the Line hot AC input and regulation is on the - supplies side.