Yes Ted
@Ted farkas,
@mikerezny mentioned that earlier. It is only when you get into the operation of absorption fridges that incorrect operation problems are explained fully. You are not the first person to fall into that trap, but there are several posts on this earlier. That is why the video on absorption fridges is so important as it brings up the pitfalls of improper operation long term. When this conversation first came up, I was able to source several items of value to members, including that one regarding the slow build up of sodium chromate crystals - not evident at first - but finally catches up and blocks the percolator tube in boiler. Speed of blockage all depends on how far off level, how long and how hot the boiler gets when water/ammonia mixture is not moving. There is another site too on how this happens in greater detail, which I will send to you when I find it again. Happy travels.