Incorrect water temp on chartplotter

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bradt

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May 7, 2009
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I have a Garmin 2010c chartplotter. The depth and sonar are reading OK. Water temperature is reading about 30degrees more than it should. Any ideas or is the transducer shot?
 
If the depth transducer is mounted within the vessel, that is, bonded or secured to the hull interior, it will generate erroneous readings.
 
There is often a menu selection on F/F to calibrate water temps but generally not for a 30* error. As Mike says in-hulls will not read water temp correctly, and if the water temp sender is external it apparenlty has failed or a connection is either corroded or wire crimped so the resistence is excessive. If the temp sender is part of a thru-hull or transom-mount T/D and the T/D is otherwise still good , you can usually just add on a separate independent temp sender or temp & speed sender combo unit.
 
Do you have the right temp scale
C' or F' set?

The difference would be about 30' +/-
 
I am having same issue but 30 deg too low, I think it is a dirty transducer.
 
I'm having the same problem with my Garmin 2010c also, it was fine for 5 seasons and then started reading wrong this season. Most of the summer it was reading between 118-122 degrees. In my experience the water temp gauges only last a few seasons at most, on my Furuno on a previous boat the sensor was separate from the transducer and could be easily changed. I looked into the Garmin and the temp sensor is in the bronze thru-hull itself. You can either replace the whole thing, or get a new insert in the thru-hull which has it's own temp sensor and a separate wire. I'm not sure if it's possible to wire this into the Garmin though to change the temperature display. I got the info off the Airmar website. It's on my winter project list so once the boat is up in a few weeks I'll figure out the best way to do it - full transducer replacement or change the insert and figure out how to wire it in.

John
 
I had same problem,got Airmar replacement insert,they supply junction box and instructions. I have both Furuno and Garmin depth finders,Furuno has capability of adjusting temperature,to a certain amount, Garmin does not,I have contacted Garmin and suggested they should add this feature,because temperature sensors all change as they age.
John
 
John,

That is exactly how mine is reading. Worked fine for years and now same symptom as yours. I had a short haul done to clean bottom and I think the problem might of coincided with that cleaning, but can't be absolutely sure.
 
30* is suspiciously close to the error difference of reading C instead of F.

Bob
 
I was reading high temps on my Garmin in my old boat. The transducer was getting warm from engine heat, because it was almost under engine. I split a 3" pvc piece to slip over the cable and the transducer and filled with foam.

Stopped the higher readings.

Sherman
 
Bob. I will check the F/C setting but I am pretty sure it is set for and reading F....
 
I think you'll find it is a hardware problem,I proved my problem with a spare transducer. I have a friend with a Furuno Navnet his temp went over 100 degrees then to all lines. He took a chance and bought the replacement insert and that fixed his problem also. I suspect Airmar might have had a bad batch of sensors. My friend bought his transducer close to the same time I did,around early 2005.
John
 
It probably is a failed sensor , but FWIW, my F/F once had very erroneous temp readings until I noticed a fender I had stored at the side of the bilge was now pressing down against the cable that exited the top of a T/H speed/temp sensor and that increased the resistence & temp readout until the fender was removed. Of course over the years I've had several seatemp sensors themselves definitely go bad. .
 
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