Touche' has an Isotherm ASU 3701 refrigeration system. It started shutting down and showing a module error code a few weeks ago. I could get it running again by jumping the temperature sensor connections and it would run while I was on the boat. A week later, I came back to the boat and observed the same error state. Repeated one more time.
Discussion with an Isotherm parts person suggested wire tying the ASU and Danfoss modules together. Isotherm ASU units have a module that plugs into the Danfoss control module to speed up the compressor when higher voltage is sensed (engine running, shore power). That didn't work. The rep said also that Isotherm no longer made the ASU module and that they now shipped units with a digital controller. https://www.indelwebastomarine.com/us/products/cooling-technology/isotherm-intelligent-temperature-control/ I purchased one of the new ITC controllers from Defender and installed it yesterday. The install was straightforward and the refrigeration seems to work great. I love being able to see the ice box temp without lifting the lid. The new controller seems to maintain the temperature very steadily. The old controller was simply a knob and 3 LED's. I kept a digital thermometer in the box to monitor the temperature. Important note: If you have such a unit and are considering this upgrade, your compressor MUST have the 101N0212 Danfoss/SECOP control module. Isotherm-parts.com will sell you the ITC controller and newer module bundled for $300. I suspect a second benefit is better control of the temperature. The old controller had the temperature sensor in the cold plate. I always wondered how it could determine the temperature in the box. I observed significant swings in temperature with the old controller. Bottom line: the beer is cold! Stella and Senor Modelo need down jackets now. :) -- Dennis C. Touche' 35-1 #83 Mandeville, LA
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