The 4823 is SH number for the HCA02-10E which is the worst amplified unit unit you can get. I even have a Leviton engineer buying CR234's to replace the HC units they have in the field. Among the problems they have is the ability to send out random on signals and to lock up on a regular basis. I would replace your CR230 with a CR234 it's a much better unit. If the fuses are bad up front, there is nothing else to do. I misspoke above, the CR234's are $109 the CR230's are now $90.

[Link: homeautomationnet.com]
[Link: homeautomationnet.com]

I have not heard of the failure mode you are describing. It's unfortunate that you are having such a bad problem, it is unusual, if they go a year they usually go for many times that unless they get hit by a spike of some type.

Bill
www.homeautomationnet.com