I went to my boat over the weekend and was greeted by a wonderful aroma. Apparently my refrigerator/freezer had quit some time in the previous two weeks since I had been to the boat and from the smell it was probably near the begining of the two weeks, but never let it be said that I didn't take an opportunity to learn something from a broken piece of equipment
Having gone through the diagnostic procedures in my manual I determined that the control module had failed. So this morning I placed a call to a most helpful fellow at Novakool technical support. I told him that I had gone through the diagnostic procedure and landed on the step that said replace the control module, but I asked him to review my steps and results and a few things I had noted that were not strictly in the trouble shooting tree. When I noted that the fan was running but the the compressor
was not and the fan would eventually shut off he asked if I had unplugged the fan. I had not as that was not a step in the diagnostic tree. He then informs me that the Danfoss controllers have a protection circuit in them that prevents the compressor
from starting when the fan draws more than .5 amps and that the fans start out new drawing .25 amps but after 8-10 years commonly start to reach the .5 amps range. He also added that a thermal protection circuit will eventually shut the fan off as well but the compressor will not even attempt to start. My unit has been in service
8 years-9 months. He said disconnect the fan, if the compressor starts then the problem is the fan which is much cheaper than a $200+ controller.
We talking about the Danfoss 101N0210 controller and from looking around it appears that this is used in many brands including frigo-boat and Isotherm
as well as Novakool, so the information probably applies widely. I'm sharing this in the hope that I might save someone a bit of grief and some time should they have issues with an older refrigeration