Hot water heater. No hot water

Discussion in 'General Maintenance/Repair Questions' started by MiLoII, Oct 2, 2018.

  1. MiLoII

    MiLoII Member

    31
    Jul 14, 2017
    Southern Lake Michigan
    320 Sundancer 2005
    Previously 300 Doral 1999
    350 Mag MPI Inboard V Drives
    Good day fellow Club Sea Ray members I'm looking for some guidance to troubleshoot my hot water heater I suddenly have no hot water. There were no signs of failure, i.e. water was always hot and then one day no hot water. I know you'll want to know what kind of heater I have but it's cold and dark tonight so not wanting to go into bilge and not sure there is a brand name readily visible I'll can say I have a 2005 vintage 320 Sundancer with what I presume is the original water heater. I have reviewed owners manual and all other user manuals I have and I have them for every conceivable component on my boat except the water heater. I see one mention in the electronic schematics but it doesn't really provide me with any usable information admittedly I'm not even a novice with wiring g schematics.

    I only have a water breaker on the cabin AC panel. I can't find mention of any fuses in the aft or forward fuse panels or anywhere else. There are forward and aft accessory fuses and I'm wondering if one of those might be associated with the water heater in my mind my first course of action should be to determine if there is electricity to the water heater when I have the circuit breaker turned on and I'm looking for the best (read easiest and most efficient) way to check that. Any free advice is appreciated
     
    Last edited: Oct 2, 2018
  2. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    If the heater is original to the boat it is probably the element. If you can get to the front of the heater there is a cover. If you pull the cover off and disconnect the wires to the element use your multi meter set on ohms if you it is failed you will get no reading. If the heater is original to the boat you probably need to replace it before it leaks mine lasted 12 years before it leaked. If you replace it try to get the same model.
     
    MiLoII likes this.
  3. gerryb

    gerryb Well-Known Member TECHNICAL Contributor

    Oct 12, 2006
    Somers Point, NJ
    "On Vacation"
    2006 40 Sundancer
    Raymarine E125 & HD Radar + Garmin 5208
    QSB5.9 380 Cummins
    Usual suspects are the thermostat or the thermal cut-off. Both relatively inexpensive parts which should be kept on board as spares anyway IMO.
     
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  4. gerryb

    gerryb Well-Known Member TECHNICAL Contributor

    Oct 12, 2006
    Somers Point, NJ
    "On Vacation"
    2006 40 Sundancer
    Raymarine E125 & HD Radar + Garmin 5208
    QSB5.9 380 Cummins
    That said, with 13 years on it, you may have to face the buy-new vs attempt-to-repair question.
     
  5. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Does your cabin AC panel have an amp meter? If it does turn the water heater breaker off then on. If the the amp meter needle doesn't jump 10-12 amps then it is not drawing current. As said the most likely cause is the element or the thermal limit switch. At 13 years the water heater is getting old and if badly corroded or leaking it may need replacing.
     
  6. MiLoII

    MiLoII Member

    31
    Jul 14, 2017
    Southern Lake Michigan
    320 Sundancer 2005
    Previously 300 Doral 1999
    350 Mag MPI Inboard V Drives
    Thank you. No amp meter just volts
     
  7. MiLoII

    MiLoII Member

    31
    Jul 14, 2017
    Southern Lake Michigan
    320 Sundancer 2005
    Previously 300 Doral 1999
    350 Mag MPI Inboard V Drives
    Perfect thank you. Will attempt later this week
     
  8. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Make sure the AC breaker is off before you take cover off. Maybe disconnect the shore power to be safe.
     
    MiLoII likes this.
  9. wayne0

    wayne0 Active Member

    379
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    It could be the hi-temp cut off which has a reset button on the back. Push to re-set. (one of the two thermostat buttons) Easy fix if that's it. If the element proves good, the thermostats can be found as a pair on Amazon. Did mine twice.
     
  10. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    I purchased a new hot water tank and it would not stop heating. The supplier was willing to send a service teck out to fix it but not the part. I took the old thermostat off the old heater and it worked fine. I then ordered a new thermostat. It comes with two sensors one low temp to start element one high to turn off the element cost $11. I took the element out of the old tank. It did not look well but still worked.
     
  11. Toolking

    Toolking New Member

    7
    Oct 2, 2013
    Seattle
    320 Sundancer 2007
    350 Mercruiser V Drive
    Same thing happened to us on our 2007 320. any idea who the Mfr is?
    (I could just go look).
     
  12. Ididntdoit

    Ididntdoit Well-Known Member

    Dec 5, 2007
    Newport, RI
    300 Sundancer
    5.0MPI Bravo III

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