Two Failed 6NAs - Line or Load?
Hi everyone,
I have a room where I have just experienced my second RRD-6NA failure (the so-called three LED failure) in six months. The 6NA controls an integrated LED in a ceiling fan (directly, no canopy module is installed) and before the failure, the dimmer worked without issue. As is recommended, the 6NA is programmed for reverse phase control and not left to automatically determine the phase.
Some other pieces of information - some of which might be useful, others might be a red herring:
1. I had noticed that the ceiling fan light in this room will periodically flicker (maybe once every few days for 5-7 seconds).
2. The house is protected by a Siemens whole-house surge suppression system; as my memory serves, I started to notice the flicker after this system was installed; the surge suppression system was installed as mitigation against failing very expensive electronic switches and integrated LED lighting after the first 6NA failure.
1. I have another room (on a different circuit) with the same fan and a RRD-6NA also controls the integrated LED; that dimmer seems to be working fine, but only is used maybe once a month, whereas the room experiencing the failure is used multiple times a day. I have not noticed any lighting flicker in that room.
2. A RRD-2ANF controls the ceiling fan speed; this switch seems to work fine.
3. Prior to the installation of the RadioRA2 controls the room had a MACL-153M and a MA-FQ4FM controlling the integrated light and the ceiling fan; neither of these controls experienced any failures in 4+ years of service. However, the ceiling fan (two different ceiling fans, actually) causes a noticable hum at 60 Hz when it is on, which was puzzling - the other room with the same fan and the same controls (originally Maestro, also converted to RadioRA2) does not have a similar hum. The hum was significantly reduced, but not entirely eliminated, when the RadioRA2 controls were installed.
I have (always) suspected a neutral issue with this particular circuit, but have never been able to identify a specific cause. I am open to any and all suggestions as to how to best troubleshoot or diagnose an issue as I would rather not have to buy a fourth replacement dimmer...
Thanks,
Jeff