9-year old post, I know, but I'm going thru this now with a Raymarine ST60+ thermometer, and searching the archives, so I thought I'd update with a possible solution for others who may be searching. I ran across an excellent video from a guy that clearly explains how to fix this. Going to give this a try. Only requires modest soldering skills and a resister which is around $1.00.The thermistors in Airmar transducers ALWAYS eventually fail. Always. It is the temp sensor. And there is no way to fix them.
Thats very interesting. And might be worth a try. But if you look at the attached document, you see that a 'open' failure is much more common than a 'drift' failure. And the drift might not be linear, meaning that even if you can calibrate it once, it might be right only for that temp. but for a buck, worth a try. But read the resistance first. If it reads ZERO, its open dead. or --- its a short and dead.9-year old post, I know, but I'm going thru this now with a Raymarine ST60+ thermometer, and searching the archives, so I thought I'd update with a possible solution for others who may be searching. I ran across an excellent video from a guy that clearly explains how to fix this. Going to give this a try. Only requires modest soldering skills and a resister which is around $1.00.