We've got an Autohelm package on the boat we purchased in August with ST60+ instruments. The speed sensor reported 0KTS during survey. I cleaned the paddle and it turned free during survey haulout and the instrument worked fine for several weeks after that. Then, the speed returned to 0KTS but the temperature read fine. I casually brushed the paddle while in the water (not brave enough to pull it out while floating yet, want to try in on the hard first. No idea when the last time this was done) and it was no help. Last weekend the temperature suddenly doubled reporting about 135F seawater. I lifted the instrument and measured resistance across what appears to be a 10k thermistor and it correlated well to a 10k chart suggesting water temp at the marina was near the expected value.
Am I jumping the gun to assume the display has gone bad given the temperature sensor seems like it is working or should I check something else? Thanks, Jeff
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