It's not uncommon for the thermistor to fail. That can affect the temperature reading, but not the speed. Definitely pull the sensor. It may be fouled, or a magnet in one of the vanes might have come loose. I don't recommend painting the paddle wheel. Since the boat has been on the hard for some time, you might want to replace the "O" rings surrounding the sensor.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Wed, Sep 23, 2020 at 3:03 PM Jeffrey Brideau <bride...@gmail.com> wrote: > We have the plug. I just don't know what condition the through-hull is in > given we've never removed it and I doubt the previous owner had done it in > the past decade as the boat had been sitting on the hard for the past 5 > years prior to this summer. > > Does nobody think the temperature reading is abnormal? > > On Wed, Sep 23, 2020 at 11:40 AM Hoyt, Mike <mike.h...@impgroup.com> > wrote: > >> Hi Jeff >> >> >> >> If you have the screw on plug for the transducer then you should pull the >> transducer. Suprisingly little water comes in with the ST60 speed >> transducer removed. Process is 1. Unscrew the retaining ring, 2. Pull out >> the transducer, 3. Screw on the plug in place of the transducer. Takes >> less than ten seconds and not a lot of water comes in. >> >> >> >> Transducers foul by this time of year and require cleaning. Likely the >> boat has been in the water for a number of months and the water has been >> warm. >> >> >> >> This is pretty normal. >> >> >> >> Mike Hoyt >> >> Persistence >> >> Halifax, Nova Scotia >> >> >> >> *From:* Jeffrey Brideau <bride...@gmail.com> >> *Sent:* September 23, 2020 12:35 PM >> *To:* Stus-List <cnc-list@cnc-list.com> >> *Subject:* Stus-List Raymarine ST60+ Speed >> >> >> >> 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 >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> <https://urldefense.com/v3/__https://www.paypal.me/stumurray__;!!LIr3w8kk_Xxm!74tLadltXT4EGreF-Z7-r1iyiIZvLAuqg6qVgcInk2hbo5OrBS9XkEsOJ6BdTGnAxXE$> >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- > https://urldefense.com/v3/__https://www.paypal.me/stumurray__;!!LIr3w8kk_Xxm!74tLadltXT4EGreF-Z7-r1iyiIZvLAuqg6qVgcInk2hbo5OrBS9XkEsOJ6BdTGnAxXE$ > >
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