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inaccurate water temp display

Discussion in 'Yamaha AR240, SX240, 242 Limited / S / X/ E-Series' started by WildCatFan54, Jun 4, 2018.

  1. WildCatFan54

    WildCatFan54 Jet Boat Lover

    Messages:
    149
    Location:
    Lexington , Ky.
    Ratings:
    +95 / 0
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    My Connex screen is showing artificially high water temps ? For the last couple weeks it has been showing between 92-98 in both float mode and while in motion. I believe the depth gauge to be accurate. I know the water temp is actually between 80-82. Any suggestions for fixing this issue short of taking it back to the dealer would be greatly appreciated.
     
  2. ttzz

    ttzz Jet Boat Addict

    Messages:
    371
    Location:
    Oronoco, MN
    Ratings:
    +400 / 9
    Boat Make:
    Yamaha
    Year:
    2017
    Boat Model:
    X
    Boat Length:
    21
    In my experience, the water temp on most bodies of water is much warmer in the top layer of water. Not sure if that is what is happening to you but just remember the sensor is reading that top layer of water so it will typically read high. Having said that, the difference that you indicate you are seeing does seem high.
     
    • Agree Agree x 1
  3. Julian

    Julian Jetboaters Fleet Admiral Staff Member Administrator

    Messages:
    11,440
    Location:
    Raleigh, NC 27614
    Ratings:
    +8,509 / 120
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    242X E-Series
    Boat Length:
    24
    Totally agree....I'll bet if you stick a temp sensor in the top inch of water you'll find that the temp are way higher there than 3-4 feet below the surface. Surface temperatures are also majorly impacted by wind direction. If you are on the end of the lake with the wind blowing towards you, all that warm surface water will be blown your way. Conversely, if you are at the other end water will get pulled up from the bottom as the surface water is blown away. Real world example last year on Falls lake.....down wind lake surface temp was 99 degrees....up wind surface temp was 92 degrees (and yes...the water was that hot....and we moved to the upwind side to get cooler water, and below the surface it was likely in the 80s)
     
  4. WildCatFan54

    WildCatFan54 Jet Boat Lover

    Messages:
    149
    Location:
    Lexington , Ky.
    Ratings:
    +95 / 0
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    Do the depth and water temp come from the same sensor ? All I know is that we drop anchor pretty much in the same spot on the lake (Cumberland) each time out. It is between 40-50 feet of water depending on time of year and if dam valves are open or closed ? In the heat of last summer (July and August) my screen was saying 80-82 degrees. Now in late May the same gauge on the same boat in the same part of the lake is telling me low to mid 90s ? I don't doubt anything you are saying and very much appreciate your input , just think the variance is excessive ? Meat thermometer will be making the next trip with us !! lol
     
  5. ttzz

    ttzz Jet Boat Addict

    Messages:
    371
    Location:
    Oronoco, MN
    Ratings:
    +400 / 9
    Boat Make:
    Yamaha
    Year:
    2017
    Boat Model:
    X
    Boat Length:
    21
    Yeah I don't what your weather is like down there but up here in MN I historically am only in the water with a wet suit on Memorial weekend. This year though we had a string of 90+ and the water felt great, in fact the top 20" felt down right warm - if you took a dive though down further it was freezing. So I'd be interested in your thermometer experiment on your next trip out but I'd say its definitely possible that the temp displayed is accurate for the bottom of the boat.
    I'll let anyone else correct me if I'm wrong but I'm pretty sure that the temp sensor is in the depth transducer unit.
     
  6. BBottoms

    BBottoms Well-Known Member

    Messages:
    74
    Location:
    Buffalo, KY
    Ratings:
    +82 / 0
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    AR
    Boat Length:
    24
    I'm having a simar issue with the temp reading and I'm certain it's wrong. Water temps were in the 80s the last few times we've been out. Reading was in the high 90s a few weeks ago, then up in the 100s the next week, even up to 117 last time I was out. Now it just says "err". It won't even read in the garage with the key on. Wasn't going to worry about it until end of season so I wasn't out of commission during boating season but I hope the depth transducer doesn't start having issues if the unit is one in the same. I can live without a temp reading but not a depth.
     
  7. Mainah

    Mainah Jetboaters Captain

    Messages:
    2,117
    Location:
    Chapin, SC
    Ratings:
    +2,527 / 19
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    Limited S
    Boat Length:
    24
    Temp and depth are from the same factory transducer and the data is sent to Connext digitally. Getting readings that are far off inidicates that the transducer is filthy, damaged, or you somehow have very warm water in your boat gathering near the transducer.
     
    • Agree Agree x 1
  8. Neutron

    Neutron Jetboaters Lieutenant

    Messages:
    1,131
    Location:
    New Bern, NC
    Ratings:
    +1,108 / 7
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    Mine has always read high by about 5 degrees since day one. Its clean and like new.
    Every time i tie up to another boat i always compare it and its always 5 degrees high
     

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