Product review (3 stars): Replace the uv LED yourself and save money
Another reviewer suggested to replace the uv LED yourself and save the money. Look at the uv LED in freezer on the left side with a digital camera. If you do not see a light, the uv LED is probably bad. A uv LED can be bought a dollar or so, or, as I did, salvaged from an unused remote.

I cannot find the reviewer who suggested this, but many thanks.
A few minutes with a soldering iron and the unit is working again at no cost.